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1.8.9 forge wont launch

Sukariaa
in Support & Bug Reports

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Posted 
Failed to download file, the file contents differ from what was expected.
Name: jopt-simple-4.6.jar
URL: https://libraries.minecraft.net/net/sf/jopt-simple/jopt-simple/4.6/jopt-simple-4.6.jar
Filename on disk: jopt-simple-4.6.jar
Path: C:\Users\skyle\AppData\Roaming\.minecraft\libraries\net\sf\jopt-simple\jopt-simple\4.6\jopt-simple-4.6.jar
Exists: File


I get this error have no idea what to do
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https://forums.minecraftforge.net/topic/76454-189-forge-wont-launch/
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