Minecraft Forums

Having a problem running and downading 1.12 and got this message an could use some help:

Unable to save download. 1.12.jar
Name: 1.12.jar
URL: https://launcher.mojang.com/mc/game/1.12/client/909823f9c467f9934687f136bc95a667a0d19d7f/client.jar
Error details: Attempting to move successful download to C:/Users\Jacob\AppData\Roaming\.minecraft\versions\1.12/1.12.jar
The process cannot access the file because it is being used by another process
Filename on disk: d85f-3059-0fd7-28b5
Path: C:\Users\Jacob\AppData\Local\Temp\d85f-3059-0fd7-28b5
Exists: file

Ok new error:

Unable to save download. netty-all-4.1.9.Final.jar
Name: netty-all-4.1.9.Final.jar
URL: https://libraries.minecraft.net/io/netty/netty-all/4.1.9.Final/netty-all-4.1.9.Final.jar
Error details: Attempting to move successful download to C:/Users\Jacob\AppData\Roaming\.minecraft\libraries\io/netty/netty-all/4.1.9.Final/netty-all-4.1.9.Final.jar
The process cannot access the file because it is being used by another process
Filename on disk: 89c0-2d29-f8cb-59bb
Path: C:\Users\Jacob\AppData\Local\Temp\89c0-2d29-f8cb-59bb
Exists: file

http://www.minecraftforum.net/forums/support/unmodified-minecraft-client/2827415-1-12-faqs-read-before-posting