Disable your 3rd party Antivirus (AVG, Avast, McAfee, etc.) and Windows Defender Real-time protection before running the setup.exe.
If you are reading this, you are likely caught in the crossfire of the infamous and Unarc.dll Error 7 . This problem has plagued PC gamers and software installers for over a decade, particularly when dealing with repacks from popular groups. isdonedll error unarcdll error7 best