Minecraft Forums

So when I start up my minecraft launcher it just stays on downloading realms-1.5.8.jar and then it just stops downloading. I'm playing on a mac. Do I need to download the latest java version or anything? This is what it says in the launcher log.

[16:12:17 INFO]: Minecraft Launcher 1.5.3 (through bootstrap 5) started on osx...
[16:12:17 INFO]: Current time is Oct 19, 2014 4:12:17 PM
[16:12:17 INFO]: System.getProperty('os.name') == 'Mac OS X'
[16:12:17 INFO]: System.getProperty('os.version') == '10.7.5'
[16:12:17 INFO]: System.getProperty('os.arch') == 'x86_64'
[16:12:17 INFO]: System.getProperty('java.version') == '1.6.0_65'
[16:12:17 INFO]: System.getProperty('java.vendor') == 'Apple Inc.'
[16:12:17 INFO]: System.getProperty('sun.arch.data.model') == '64'
[16:12:18 INFO]: Refreshing local version list...
[16:12:18 INFO]: Refreshing remote version list...
[16:12:19 INFO]: Refresh complete.
[16:12:19 INFO]: Loaded 2 profile(s); selected 'ExtremeMango123'
[16:12:19 INFO]: Refreshing auth...
[16:12:19 INFO]: Logging in with access token
[16:12:22 INFO]: Getting syncinfo for selected version
[16:12:22 INFO]: Queueing library & version downloads
[16:12:22 INFO]: Download job 'Version & Libraries' started (16 threads, 32 files)
[16:12:22 INFO]: Attempting to download /Users/natsufan321/Library/Application Support/minecraft/libraries/com/google/code/gson/gson/2.2.4/gson-2.2.4.jar for job 'Version & Libraries'... (try 0)
[16:12:22 INFO]: Attempting to download /Users/natsufan321/Library/Application Support/minecraft/libraries/tv/twitch/twitch/6.5/twitch-6.5.jar for job 'Version & Libraries'... (try 0)
[16:12:22 INFO]: Attempting to download /Users/natsufan321/Library/Application Support/minecraft/libraries/java3d/vecmath/1.5.2/vecmath-1.5.2.jar for job 'Version & Libraries'... (try 0)
[16:12:22 INFO]: Attempting to download /Users/natsufan321/Library/Application Support/minecraft/libraries/net/java/jinput/jinput/2.0.5/jinput-2.0.5.jar for job 'Version & Libraries'... (try 0)
[16:12:22 INFO]: Attempting to download /Users/natsufan321/Library/Application Support/minecraft/libraries/com/google/guava/guava/17.0/guava-17.0.jar for job 'Version & Libraries'... (try 0)
[16:12:22 INFO]: Attempting to download /Users/natsufan321/Library/Application Support/minecraft/libraries/com/paulscode/codecwav/20101023/codecwav-20101023.jar for job 'Version & Libraries'... (try 0)
[16:12:22 INFO]: Attempting to download /Users/natsufan321/Library/Application Support/minecraft/libraries/tv/twitch/twitch-platform/6.5/twitch-platform-6.5-natives-osx.jar for job 'Version & Libraries'... (try 0)
[16:12:22 INFO]: Attempting to download /Users/natsufan321/Library/Application Support/minecraft/libraries/net/sf/jopt-simple/jopt-simple/4.6/jopt-simple-4.6.jar for job 'Version & Libraries'... (try 0)
[16:12:22 INFO]: Attempting to download /Users/natsufan321/Library/Application Support/minecraft/libraries/com/mojang/realms/1.5.8/realms-1.5.8.jar for job 'Version & Libraries'... (try 0)
[16:12:22 INFO]: Attempting to download /Users/natsufan321/Library/Application Support/minecraft/libraries/io/netty/netty-all/4.0.15.Final/netty-all-4.0.15.Final.jar for job 'Version & Libraries'... (try 0)
[16:12:22 INFO]: Attempting to download /Users/natsufan321/Library/Application Support/minecraft/libraries/com/ibm/icu/icu4j-core-mojang/51.2/icu4j-core-mojang-51.2.jar for job 'Version & Libraries'... (try 0)
[16:12:22 INFO]: Attempting to download /Users/natsufan321/Library/Application Support/minecraft/libraries/org/apache/logging/log4j/log4j-core/2.0-beta9/log4j-core-2.0-beta9.jar for job 'Version & Libraries'... (try 0)
[16:12:22 INFO]: Attempting to download /Users/natsufan321/Library/Application Support/minecraft/libraries/org/apache/commons/commons-compress/1.8.1/commons-compress-1.8.1.jar for job 'Version & Libraries'... (try 0)
[16:12:22 INFO]: Attempting to download /Users/natsufan321/Library/Application Support/minecraft/libraries/commons-logging/commons-logging/1.1.3/commons-logging-1.1.3.jar for job 'Version & Libraries'... (try 0)
[16:12:22 INFO]: Attempting to download /Users/natsufan321/Library/Application Support/minecraft/libraries/net/java/jinput/jinput-platform/2.0.5/jinput-platform-2.0.5-natives-osx.jar for job 'Version & Libraries'... (try 0)
[16:12:22 INFO]: Attempting to download /Users/natsufan321/Library/Application Support/minecraft/libraries/net/sf/trove4j/trove4j/3.0.3/trove4j-3.0.3.jar for job 'Version & Libraries'... (try 0)
[16:12:24 INFO]: Download job 'Resources' skipped as there are no files to download
[16:12:24 INFO]: Job 'Resources' finished successfully (took 0:00:00.000)
[16:12:24 INFO]: Finished downloading /Users/natsufan321/Library/Application Support/minecraft/libraries/net/sf/trove4j/trove4j/3.0.3/trove4j-3.0.3.jar for job 'Version & Libraries': Local file matches local checksum, using that
[16:12:24 INFO]: Finished downloading /Users/natsufan321/Library/Application Support/minecraft/libraries/io/netty/netty-all/4.0.15.Final/netty-all-4.0.15.Final.jar for job 'Version & Libraries': Local file matches local checksum, using that
[16:12:24 INFO]: Attempting to download /Users/natsufan321/Library/Application Support/minecraft/libraries/com/paulscode/libraryjavasound/20101123/libraryjavasound-20101123.jar for job 'Version & Libraries'... (try 0)
[16:12:24 INFO]: Finished downloading /Users/natsufan321/Library/Application Support/minecraft/libraries/net/java/jinput/jinput-platform/2.0.5/jinput-platform-2.0.5-natives-osx.jar for job 'Version & Libraries': Local file matches local checksum, using that
[16:12:24 INFO]: Attempting to download /Users/natsufan321/Library/Application Support/minecraft/libraries/org/lwjgl/lwjgl/lwjgl_util/2.9.2-nightly-20140822/lwjgl_util-2.9.2-nightly-20140822.jar for job 'Version & Libraries'... (try 0)
[16:12:24 INFO]: Finished downloading /Users/natsufan321/Library/Application Support/minecraft/libraries/com/paulscode/libraryjavasound/20101123/libraryjavasound-20101123.jar for job 'Version & Libraries': Local file matches local checksum, using that
[16:12:24 INFO]: Attempting to download /Users/natsufan321/Library/Application Support/minecraft/libraries/commons-io/commons-io/2.4/commons-io-2.4.jar for job 'Version & Libraries'... (try 0)
[16:12:24 INFO]: Finished downloading /Users/natsufan321/Library/Application Support/minecraft/libraries/org/lwjgl/lwjgl/lwjgl_util/2.9.2-nightly-20140822/lwjgl_util-2.9.2-nightly-20140822.jar for job 'Version & Libraries': Local file matches local checksum, using that
[16:12:24 INFO]: Attempting to download /Users/natsufan321/Library/Application Support/minecraft/libraries/org/apache/httpcomponents/httpclient/4.3.3/httpclient-4.3.3.jar for job 'Version & Libraries'... (try 0)
[16:12:24 INFO]: Finished downloading /Users/natsufan321/Library/Application Support/minecraft/libraries/commons-io/commons-io/2.4/commons-io-2.4.jar for job 'Version & Libraries': Local file matches local checksum, using that
[16:12:24 INFO]: Attempting to download /Users/natsufan321/Library/Application Support/minecraft/libraries/commons-codec/commons-codec/1.9/commons-codec-1.9.jar for job 'Version & Libraries'... (try 0)
[16:12:24 INFO]: Finished downloading /Users/natsufan321/Library/Application Support/minecraft/libraries/com/google/guava/guava/17.0/guava-17.0.jar for job 'Version & Libraries': Local file matches local checksum, using that
[16:12:24 INFO]: Attempting to download /Users/natsufan321/Library/Application Support/minecraft/libraries/com/mojang/authlib/1.5.17/authlib-1.5.17.jar for job 'Version & Libraries'... (try 0)
[16:12:24 INFO]: Finished downloading /Users/natsufan321/Library/Application Support/minecraft/libraries/commons-codec/commons-codec/1.9/commons-codec-1.9.jar for job 'Version & Libraries': Local file matches local checksum, using that
[16:12:24 INFO]: Attempting to download /Users/natsufan321/Library/Application Support/minecraft/libraries/com/paulscode/soundsystem/20120107/soundsystem-20120107.jar for job 'Version & Libraries'... (try 0)
[16:12:24 INFO]: Finished downloading /Users/natsufan321/Library/Application Support/minecraft/libraries/com/mojang/authlib/1.5.17/authlib-1.5.17.jar for job 'Version & Libraries': Local file matches local checksum, using that
[16:12:24 INFO]: Attempting to download /Users/natsufan321/Library/Application Support/minecraft/libraries/org/lwjgl/lwjgl/lwjgl/2.9.2-nightly-20140822/lwjgl-2.9.2-nightly-20140822.jar for job 'Version & Libraries'... (try 0)
[16:12:24 INFO]: Finished downloading /Users/natsufan321/Library/Application Support/minecraft/libraries/com/paulscode/soundsystem/20120107/soundsystem-20120107.jar for job 'Version & Libraries': Local file matches local checksum, using that
[16:12:24 INFO]: Attempting to download /Users/natsufan321/Library/Application Support/minecraft/libraries/org/apache/commons/commons-lang3/3.3.2/commons-lang3-3.3.2.jar for job 'Version & Libraries'... (try 0)
[16:12:24 INFO]: Finished downloading /Users/natsufan321/Library/Application Support/minecraft/libraries/org/apache/httpcomponents/httpclient/4.3.3/httpclient-4.3.3.jar for job 'Version & Libraries': Local file matches local checksum, using that
[16:12:24 INFO]: Attempting to download /Users/natsufan321/Library/Application Support/minecraft/libraries/com/paulscode/librarylwjglopenal/20100824/librarylwjglopenal-20100824.jar for job 'Version & Libraries'... (try 0)
[16:12:24 INFO]: Attempting to download /Users/natsufan321/Library/Application Support/minecraft/libraries/com/paulscode/codecjorbis/20101023/codecjorbis-20101023.jar for job 'Version & Libraries'... (try 0)
[16:12:24 INFO]: Finished downloading /Users/natsufan321/Library/Application Support/minecraft/libraries/com/paulscode/librarylwjglopenal/20100824/librarylwjglopenal-20100824.jar for job 'Version & Libraries': Local file matches local checksum, using that
[16:12:24 INFO]: Attempting to download /Users/natsufan321/Library/Application Support/minecraft/libraries/org/apache/logging/log4j/log4j-api/2.0-beta9/log4j-api-2.0-beta9.jar for job 'Version & Libraries'... (try 0)
[16:12:24 INFO]: Finished downloading /Users/natsufan321/Library/Application Support/minecraft/libraries/org/apache/logging/log4j/log4j-api/2.0-beta9/log4j-api-2.0-beta9.jar for job 'Version & Libraries': Local file matches local checksum, using that
[16:12:24 INFO]: Attempting to download /Users/natsufan321/Library/Application Support/minecraft/libraries/net/java/jutils/jutils/1.0.0/jutils-1.0.0.jar for job 'Version & Libraries'... (try 0)
[16:12:24 INFO]: Finished downloading /Users/natsufan321/Library/Application Support/minecraft/libraries/net/java/jutils/jutils/1.0.0/jutils-1.0.0.jar for job 'Version & Libraries': Local file matches local checksum, using that
[16:12:24 INFO]: Attempting to download /Users/natsufan321/Library/Application Support/minecraft/libraries/org/apache/httpcomponents/httpcore/4.3.2/httpcore-4.3.2.jar for job 'Version & Libraries'... (try 0)
[16:12:24 INFO]: Finished downloading /Users/natsufan321/Library/Application Support/minecraft/libraries/com/ibm/icu/icu4j-core-mojang/51.2/icu4j-core-mojang-51.2.jar for job 'Version & Libraries': Local file matches local checksum, using that
[16:12:24 INFO]: Attempting to download /Users/natsufan321/Library/Application Support/minecraft/libraries/org/lwjgl/lwjgl/lwjgl-platform/2.9.2-nightly-20140822/lwjgl-platform-2.9.2-nightly-20140822-natives-osx.jar for job 'Version & Libraries'... (try 0)
[16:12:24 INFO]: Finished downloading /Users/natsufan321/Library/Application Support/minecraft/libraries/commons-logging/commons-logging/1.1.3/commons-logging-1.1.3.jar for job 'Version & Libraries': Local file matches local checksum, using that
[16:12:24 INFO]: Finished downloading /Users/natsufan321/Library/Application Support/minecraft/libraries/com/paulscode/codecjorbis/20101023/codecjorbis-20101023.jar for job 'Version & Libraries': Local file matches local checksum, using that
[16:12:24 INFO]: Attempting to download /Users/natsufan321/Library/Application Support/minecraft/versions/1.8/1.8.jar for job 'Version & Libraries'... (try 0)
[16:12:24 INFO]: Finished downloading /Users/natsufan321/Library/Application Support/minecraft/libraries/org/apache/commons/commons-compress/1.8.1/commons-compress-1.8.1.jar for job 'Version & Libraries': Local file matches local checksum, using that
[16:12:24 INFO]: Finished downloading /Users/natsufan321/Library/Application Support/minecraft/libraries/org/apache/commons/commons-lang3/3.3.2/commons-lang3-3.3.2.jar for job 'Version & Libraries': Local file matches local checksum, using that
[16:12:24 INFO]: Finished downloading /Users/natsufan321/Library/Application Support/minecraft/libraries/tv/twitch/twitch-platform/6.5/twitch-platform-6.5-natives-osx.jar for job 'Version & Libraries': Local file matches local checksum, using that
[16:12:24 INFO]: Finished downloading /Users/natsufan321/Library/Application Support/minecraft/libraries/org/apache/logging/log4j/log4j-core/2.0-beta9/log4j-core-2.0-beta9.jar for job 'Version & Libraries': Local file matches local checksum, using that
[16:12:24 INFO]: Finished downloading /Users/natsufan321/Library/Application Support/minecraft/libraries/net/java/jinput/jinput/2.0.5/jinput-2.0.5.jar for job 'Version & Libraries': Local file matches local checksum, using that
[16:12:24 INFO]: Finished downloading /Users/natsufan321/Library/Application Support/minecraft/libraries/com/paulscode/codecwav/20101023/codecwav-20101023.jar for job 'Version & Libraries': Local file matches local checksum, using that
[16:12:24 INFO]: Finished downloading /Users/natsufan321/Library/Application Support/minecraft/libraries/java3d/vecmath/1.5.2/vecmath-1.5.2.jar for job 'Version & Libraries': Local file matches local checksum, using that
[16:12:24 INFO]: Finished downloading /Users/natsufan321/Library/Application Support/minecraft/libraries/tv/twitch/twitch/6.5/twitch-6.5.jar for job 'Version & Libraries': Local file matches local checksum, using that
[16:12:24 INFO]: Finished downloading /Users/natsufan321/Library/Application Support/minecraft/libraries/com/google/code/gson/gson/2.2.4/gson-2.2.4.jar for job 'Version & Libraries': Local file matches local checksum, using that
[16:12:24 INFO]: Finished downloading /Users/natsufan321/Library/Application Support/minecraft/libraries/net/sf/jopt-simple/jopt-simple/4.6/jopt-simple-4.6.jar for job 'Version & Libraries': Local file matches local checksum, using that
[16:12:24 INFO]: Finished downloading /Users/natsufan321/Library/Application Support/minecraft/libraries/org/lwjgl/lwjgl/lwjgl/2.9.2-nightly-20140822/lwjgl-2.9.2-nightly-20140822.jar for job 'Version & Libraries': Local file matches local checksum, using that
[16:12:24 INFO]: Finished downloading /Users/natsufan321/Library/Application Support/minecraft/libraries/org/lwjgl/lwjgl/lwjgl-platform/2.9.2-nightly-20140822/lwjgl-platform-2.9.2-nightly-20140822-natives-osx.jar for job 'Version & Libraries': Local file matches local checksum, using that
[16:12:24 INFO]: Finished downloading /Users/natsufan321/Library/Application Support/minecraft/libraries/org/apache/httpcomponents/httpcore/4.3.2/httpcore-4.3.2.jar for job 'Version & Libraries': Local file matches local checksum, using that
[16:12:24 WARN]: Couldn't download https://libraries.minecraft.net/com/mojang/realms/1.5.8/realms-1.5.8.jar for job 'Version & Libraries'
java.lang.RuntimeException: Checksum did not match downloaded file (Checksum was 0bfc90a1e07d9c655489f65125a33a486849db7f, downloaded 67d71bc60acdd3a3f04484f181ed556a470f3e77)
at com.mojang.launcher.updater.download.ChecksummedDownloadable.download(ChecksummedDownloadable.java:92) ~[launcher.jar:?]
at com.mojang.launcher.updater.download.DownloadJob.popAndDownload(DownloadJob.java:109) [launcher.jar:?]
at com.mojang.launcher.updater.download.DownloadJob.access$000(DownloadJob.java:12) [launcher.jar:?]
at com.mojang.launcher.updater.download.DownloadJob$1.run(DownloadJob.java:86) [launcher.jar:?]
at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:439) [?:1.6.0_65]
at java.util.concurrent.FutureTask$Sync.innerRun(FutureTask.java:303) [?:1.6.0_65]
at java.util.concurrent.FutureTask.run(FutureTask.java:138) [?:1.6.0_65]
at java.util.concurrent.ThreadPoolExecutor$Worker.runTask(ThreadPoolExecutor.java:895) [?:1.6.0_65]
at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:918) [?:1.6.0_65]
at java.lang.Thread.run(Thread.java:695) [?:1.6.0_65]
[16:12:24 INFO]: Attempting to download /Users/natsufan321/Library/Application Support/minecraft/libraries/com/mojang/realms/1.5.8/realms-1.5.8.jar for job 'Version & Libraries'... (try 1)
[16:12:24 INFO]: Finished downloading /Users/natsufan321/Library/Application Support/minecraft/versions/1.8/1.8.jar for job 'Version & Libraries': Used own copy as it matched etag
[16:12:26 WARN]: Couldn't download https://libraries.minecraft.net/com/mojang/realms/1.5.8/realms-1.5.8.jar for job 'Version & Libraries'
java.lang.RuntimeException: Checksum did not match downloaded file (Checksum was 0bfc90a1e07d9c655489f65125a33a486849db7f, downloaded 67d71bc60acdd3a3f04484f181ed556a470f3e77)
at com.mojang.launcher.updater.download.ChecksummedDownloadable.download(ChecksummedDownloadable.java:92) ~[launcher.jar:?]
at com.mojang.launcher.updater.download.DownloadJob.popAndDownload(DownloadJob.java:109) [launcher.jar:?]
at com.mojang.launcher.updater.download.DownloadJob.access$000(DownloadJob.java:12) [launcher.jar:?]
at com.mojang.launcher.updater.download.DownloadJob$1.run(DownloadJob.java:86) [launcher.jar:?]
at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:439) [?:1.6.0_65]
at java.util.concurrent.FutureTask$Sync.innerRun(FutureTask.java:303) [?:1.6.0_65]
at java.util.concurrent.FutureTask.run(FutureTask.java:138) [?:1.6.0_65]
at java.util.concurrent.ThreadPoolExecutor$Worker.runTask(ThreadPoolExecutor.java:895) [?:1.6.0_65]
at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:918) [?:1.6.0_65]
at java.lang.Thread.run(Thread.java:695) [?:1.6.0_65]
[16:12:26 INFO]: Attempting to download /Users/natsufan321/Library/Application Support/minecraft/libraries/com/mojang/realms/1.5.8/realms-1.5.8.jar for job 'Version & Libraries'... (try 2)
[16:12:27 WARN]: Couldn't download https://libraries.minecraft.net/com/mojang/realms/1.5.8/realms-1.5.8.jar for job 'Version & Libraries'
java.lang.RuntimeException: Checksum did not match downloaded file (Checksum was 0bfc90a1e07d9c655489f65125a33a486849db7f, downloaded 67d71bc60acdd3a3f04484f181ed556a470f3e77)
at com.mojang.launcher.updater.download.ChecksummedDownloadable.download(ChecksummedDownloadable.java:92) ~[launcher.jar:?]
at com.mojang.launcher.updater.download.DownloadJob.popAndDownload(DownloadJob.java:109) [launcher.jar:?]
at com.mojang.launcher.updater.download.DownloadJob.access$000(DownloadJob.java:12) [launcher.jar:?]
at com.mojang.launcher.updater.download.DownloadJob$1.run(DownloadJob.java:86) [launcher.jar:?]
at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:439) [?:1.6.0_65]
at java.util.concurrent.FutureTask$Sync.innerRun(FutureTask.java:303) [?:1.6.0_65]
at java.util.concurrent.FutureTask.run(FutureTask.java:138) [?:1.6.0_65]
at java.util.concurrent.ThreadPoolExecutor$Worker.runTask(ThreadPoolExecutor.java:895) [?:1.6.0_65]
at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:918) [?:1.6.0_65]
at java.lang.Thread.run(Thread.java:695) [?:1.6.0_65]
[16:12:27 INFO]: Attempting to download /Users/natsufan321/Library/Application Support/minecraft/libraries/com/mojang/realms/1.5.8/realms-1.5.8.jar for job 'Version & Libraries'... (try 3)
[16:12:31 WARN]: Couldn't download https://libraries.minecraft.net/com/mojang/realms/1.5.8/realms-1.5.8.jar for job 'Version & Libraries'
java.lang.RuntimeException: Checksum did not match downloaded file (Checksum was 0bfc90a1e07d9c655489f65125a33a486849db7f, downloaded 67d71bc60acdd3a3f04484f181ed556a470f3e77)
at com.mojang.launcher.updater.download.ChecksummedDownloadable.download(ChecksummedDownloadable.java:92) ~[launcher.jar:?]
at com.mojang.launcher.updater.download.DownloadJob.popAndDownload(DownloadJob.java:109) [launcher.jar:?]
at com.mojang.launcher.updater.download.DownloadJob.access$000(DownloadJob.java:12) [launcher.jar:?]
at com.mojang.launcher.updater.download.DownloadJob$1.run(DownloadJob.java:86) [launcher.jar:?]
at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:439) [?:1.6.0_65]
at java.util.concurrent.FutureTask$Sync.innerRun(FutureTask.java:303) [?:1.6.0_65]
at java.util.concurrent.FutureTask.run(FutureTask.java:138) [?:1.6.0_65]
at java.util.concurrent.ThreadPoolExecutor$Worker.runTask(ThreadPoolExecutor.java:895) [?:1.6.0_65]
at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:918) [?:1.6.0_65]
at java.lang.Thread.run(Thread.java:695) [?:1.6.0_65]
[16:12:31 INFO]: Attempting to download /Users/natsufan321/Library/Application Support/minecraft/libraries/com/mojang/realms/1.5.8/realms-1.5.8.jar for job 'Version & Libraries'... (try 4)
[16:12:34 WARN]: Couldn't download https://libraries.minecraft.net/com/mojang/realms/1.5.8/realms-1.5.8.jar for job 'Version & Libraries'
java.lang.RuntimeException: Checksum did not match downloaded file (Checksum was 0bfc90a1e07d9c655489f65125a33a486849db7f, downloaded 67d71bc60acdd3a3f04484f181ed556a470f3e77)
at com.mojang.launcher.updater.download.ChecksummedDownloadable.download(ChecksummedDownloadable.java:92) ~[launcher.jar:?]
at com.mojang.launcher.updater.download.DownloadJob.popAndDownload(DownloadJob.java:109) [launcher.jar:?]
at com.mojang.launcher.updater.download.DownloadJob.access$000(DownloadJob.java:12) [launcher.jar:?]
at com.mojang.launcher.updater.download.DownloadJob$1.run(DownloadJob.java:86) [launcher.jar:?]
at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:439) [?:1.6.0_65]
at java.util.concurrent.FutureTask$Sync.innerRun(FutureTask.java:303) [?:1.6.0_65]
at java.util.concurrent.FutureTask.run(FutureTask.java:138) [?:1.6.0_65]
at java.util.concurrent.ThreadPoolExecutor$Worker.runTask(ThreadPoolExecutor.java:895) [?:1.6.0_65]
at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:918) [?:1.6.0_65]
at java.lang.Thread.run(Thread.java:695) [?:1.6.0_65]
[16:12:34 INFO]: Attempting to download /Users/natsufan321/Library/Application Support/minecraft/libraries/com/mojang/realms/1.5.8/realms-1.5.8.jar for job 'Version & Libraries'... (try 5)
[16:12:39 WARN]: Couldn't download https://libraries.minecraft.net/com/mojang/realms/1.5.8/realms-1.5.8.jar for job 'Version & Libraries'
java.lang.RuntimeException: Checksum did not match downloaded file (Checksum was 0bfc90a1e07d9c655489f65125a33a486849db7f, downloaded 67d71bc60acdd3a3f04484f181ed556a470f3e77)
at com.mojang.launcher.updater.download.ChecksummedDownloadable.download(ChecksummedDownloadable.java:92) ~[launcher.jar:?]
at com.mojang.launcher.updater.download.DownloadJob.popAndDownload(DownloadJob.java:109) [launcher.jar:?]
at com.mojang.launcher.updater.download.DownloadJob.access$000(DownloadJob.java:12) [launcher.jar:?]
at com.mojang.launcher.updater.download.DownloadJob$1.run(DownloadJob.java:86) [launcher.jar:?]
at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:439) [?:1.6.0_65]
at java.util.concurrent.FutureTask$Sync.innerRun(FutureTask.java:303) [?:1.6.0_65]
at java.util.concurrent.FutureTask.run(FutureTask.java:138) [?:1.6.0_65]
at java.util.concurrent.ThreadPoolExecutor$Worker.runTask(ThreadPoolExecutor.java:895) [?:1.6.0_65]
at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:918) [?:1.6.0_65]
at java.lang.Thread.run(Thread.java:695) [?:1.6.0_65]
[16:12:39 ERROR]: Gave up trying to download https://libraries.minecraft.net/com/mojang/realms/1.5.8/realms-1.5.8.jar for job 'Version & Libraries'
[16:12:39 ERROR]: Job 'Version & Libraries' finished with 1 failure(s)! (took 0:00:16.335)

Same problem. I have one computer that is launching 1.8 fine. The other computer is dying on the same place yours is...

[16:12:39 ERROR]: Gave up trying to download https://libraries.minecraft.net/com/mojang/realms/1.5.8/realms-1.5.8.jar for job 'Version & Libraries'

With reason, checksum failure

its been reported as a bug, but its apparently only macs and it only started today. someone must have released an update without properly testing it on a separate mac, does anyone know how to change the checksum to match? is there any way to work around this?

I'm on a PC and im getting this bug. Can anyone help?
Edit: Updating java does not fix the bug.

I'm having the exact same problem on my PC running Windows 7. Updating java doesn't work. I tried putting the jar file it needs in the 1.8.jar but have no idea where it goes.

A few of us were having the same problem earlier today. It just started today. I had it on two of my pcs. Here's the thread:

http://www.minecraftforum.net/forums/support/unmodified-minecraft-client/2246416-minecraft-download-error
No fix yet. My desktop miraculously started working a couple of hours in. The laptop still stops when it says "downloading realms - 1.5.8 jar" or somesuch.

update, my game started working!

Same problem for me on my Windows 7 64-bit machine. I tried deleting my Minecraft directory, uninstalling Java (and all the leftover bits), reinstall the latest Java, then run the launcher and have it re-download everything, and still get the same error.