bennyaj

So I am trying to play on a 1.7.10 instal of forge but every time I try to load Minecraft from the Java launcher I get a message saying "launching the game failed", along with this text: 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: /Users/benjaminjavidan/Library/Application Support/minecraft/libraries/net/sf/jopt-simple/jopt-simple/4.5/jopt-simple-4.5.jar Exists: File How do I fix this?