GTA V ISDone.dll and Unarc.dll Error Fix

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ISDone.dll and Unarc.dll Error in GTA V. An error occurred while unpacking: Does not match checksum! Unarc.dll returned an error code: -12 ERROR. We will show you easy 2 ways to fix this problem.

In 1st Part we will show you how to update all missing dll files and in second part we will show how to manually download and update your ISDone.dll and unarc.dll according to your computer type (32 bit or 64 bit).