This threads main purpose is to let 10.5(Leopard) users and older to be able to mod the game at all. You need this since apple won't let minecraft use the latest version of Java on older Macintoshes. And since pretty much all mods aren't compatible with older Java versions. Doing this you are forcing minecraft to use the latest version (1.6). But yes, There are also some install insrtuctions here but once again, they are not the main purpose of the thread.
I do not take any kind of responsebillity for what happens to your game or your Macintosh PC in anyway. If you do everything correctly, nothing should happen. If it does, YOU did something wrong.
How to make Minecraft Modable
How to Install mods - Using pre-installed applications and no terminal
Install Mods in more ways
Using Terminal - No downloads
*** msmits71 Video on how to install***:
I know that at least 10.5 (Leopard) is having problems with mods (dunno about 10.6(Snow Leopard).
Anyway I've found the solution. So if you are trying to apply a mod on a 10.5 machine but MC won't launch properly read this:
Go to the apple menu (the apple in the upper left corner) and choose software update. It will take a while but after a few minutes you will see a list of available updates. If there is anything Java related there update. If not you already got the update and can proceed to the next step.
2: Right click your MC app and choose "Show package Content". Now open Contents and then "info.plist". Now look up the line that says:
There will be some more text around but that's not important.
Now change the "1.5+" to "1.6+" (there are no " ")
Save and close the file.
3. Open your "hard drive folder" which is usually called Macintosh HD. Then open:
System > Library > Frameworks > JavaVM.framework > Resources > Mac OS. In here you will find a file called "JavaApplicationStub”. Copy it. Now go back to resources inside the MC app and open Mac OS and paste the file in there.
4. Go to your applications folder. Then find the folder called "Utilities" then open JavaPreferences (it's kinda in the middle). Under the General tab there will be a list. There should be a line called "Java SE 6". If it isn't at the top drag it there.
Now close JavaPreferences, install the mods you want and open minecraft. It should launch correctly now
If you don't even know how to install mods read this:
What isn't underlined isn't necessary to read to install a mod but can be useful.
Since you will be messing around with the "system files you must back both saves and the bin up. Do this by going to the "your name folder" then Library then Application support then minecraft. Copy both the bin and the saves folder and save them in a safe place.
A mod is pretty much a couple of .class files. To install a mod you need to get those .class files into the minecraft.jar file located in: Your name > Library > Application Support > Minecraft > bin.
Your minecraft folder can be located in Home(your name)>Library>Application Support>Minecraft.
Here is how you easily install mods without any downloads or using terminal.
First, change the name of the minecraft.jar to minecraft.zip, then unzip it.
Add the mod files (mostly .class but somtimes folders and pictures) in the folder you get.
Mark all files in that folder (not the folder itself but the contents), right.click and choose "Compress files".
You will get a Archive.zip file. Change the name of that ZIP file into minecraft.jar. Now move that .jar file into the bin folder and replace the old one.
Once again, REMEMBER TO BACK UP ALL FILES YOU TOUCH.
But if you were to mess-up something in you Bin folder and don't have a backup, just delete the whole folder and launch the game. I will automaticly download the latest version (you will get a fresh bin folder).
Other ways of installing Mods (mac):
Terminal - Use terminal and finder to install your mods. No downloads required.
Apparently these commands will delete the contents of your desktop if you use them twice, so be careful. The best way to install mods without any downloads (Pretty much always the best) is the method used above. It's easy and fool-proof.
jar xf ~/Library/Application\ Support/minecraft/bin/minecraft.jar
Now go into the new folder in your Home folder and look up the META-INF (for newer users this might not be there, but if) and open it and delete the two files with MOJANG in there names.
Then put the mod files you want in the folder (mcjar, not META-INF).
Now type in this command in terminal:
jar uf ~/Library/Application\ Support/minecraft/bin/minecraft.jar ./
rm -rf mcjar
Do not close termianl between the commands. If you do run this command before the second one: