I get this when i try to run forge 1.8
Failed to download file, the file contents differ from what was expected.
Name: netty-all-4.0.15.Final.jar
URL: https://libraries.minecraft.net/io/netty/netty-all/4.0.15.Final/netty-all-4.0.15.Final.jar
Filename on disk: netty-all-4.0.15.Final.jar
Path: C:\Users\PC\AppData\Roaming\.minecraft\libraries\io\netty\netty-all\4.0.15.Final\netty-all-4.0.15.Final.jar
Exists: File