from TechPowerUp or MajorGeeks (search "Visual C++ runtime AIO")
ISDone.dll Unarc.dll error code 7 typically occur during the installation of large games (like FitGirl or DODI repacks) when the system fails to unpack compressed data. This is usually caused by insufficient RAM/Virtual Memory
Run the tool (type it into the Start search). Choose "Restart now and check for problems." isdonedll error unarcdll error7 best
Go to the tab and click Change under Virtual memory .
Automated Diagnostic Scan (one-click)
Highlight your primary Windows drive (typically C:) and check .
sfc /scannow chkdsk C: /f
Whether you are installing to an
Avoid installing to the system drive (C:) if it’s low on space or has errors. Use a secondary HDD/SSD with at least 30-40 GB free. from TechPowerUp or MajorGeeks (search "Visual C++ runtime
An countered or unarc.dll error with Error Code -7 usually happens when you try to install large, compressed games or software. It is a frustrating issue that abruptly stops your installation progress bar halfway through.