If increasing the virtual memory did not work, you may genuinely be missing the file. Be very careful when downloading DLL files; only use reputable sources to avoid malware.
Microsoft ended support for Windows 7 in January 2020. While many still use it for older games or hardware, the isdone.dll error is more frequent on this OS due to missing security updates and modern runtime libraries. If you frequently encounter this error, consider upgrading to Windows 10 or 11 (or a lightweight Linux distribution with Wine for older programs). You will not only see fewer DLL errors but also benefit from better security and performance. isdone.dll download windows 7 64 bit
When you run an installer that uses this script, isdone.dll handles the decompression of data. If something goes wrong—corrupted memory, lack of disk space, antivirus interference, or a faulty download—the DLL fails, and the installation crashes. If increasing the virtual memory did not work,
The most effective fix for Windows 7 64-bit users is increasing the paging file size. This gives your computer extra "fake" RAM to handle large installations. Right-click and select Properties . Click Advanced system settings on the left. While many still use it for older games
This is the #1 fix for FitGirl repacks and similar large installers. The isdone.dll error often comes with an "Unarc.dll" error code.