Board Thread:Suggestions forum/@comment-24.11.101.15-20200117222100

I try to launch the mod I am playing 1.7.10 forge and I have the mod just the mod in my folder. It won't launch and when I try (first time launching) it says this

I figured it was short so I posted it here. Failed to download file, the file contents differ from what was expected. Name: jopt-simple-4.5.jar URL: https://libraries.minecraft.net/net/sf/jopt-simple/jopt-simple/4.5/jopt-simple-4.5.jar Filename on disk: jopt-simple-4.5.jar Path: C:\Users\don\AppData\Roaming\.minecraft\libraries\net\sf\jopt-simple\jopt-simple\4.5\jopt-simple-4.5.jar Exists: files 