Real-time antivirus scanning can interfere with the unpacking process, especially with repack installers that contain compressed or encrypted data. This is a known issue on Windows 10 64-bit with Defender, Avast, Norton, and McAfee.
Disable only during installation. Re-enable immediately after the setup completes. isdone.dll error fix windows 10 64 bit
Insufficient disk space on your C: drive or destination drive prevents files from being written. Corrupted Data: Re-enable immediately after the setup completes
If you are using a FitGirl or similar repack, check the option to limit RAM usage to 2GB To update Windows and drivers: In the Performance
Outdated Windows and drivers can cause compatibility issues that lead to the Isdone.dll error. To update Windows and drivers:
In the Performance Options window, select the Advanced tab and click Change under "Virtual memory".
The installation files themselves may be corrupted or incomplete. Permissions & Security: