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The game installer itself was not downloaded fully or correctly.

: This DLL (Dynamic Link Library) file is part of the Inno Setup installer, which is used to install many software applications and games. ISDone.dll errors can occur if there's an issue with the installer or if the file itself is corrupted or missing.

Large repacks need substantial memory to handle decompression. If your RAM is low, Windows uses the hard drive (virtual memory) to assist.

: Real-time protection often blocks decompression; turn it off during the install.

The download was interrupted or incomplete.

Provide users a compact, reliable troubleshooting feature that identifies, explains, and resolves the common "isdone.dll" and "unarc.dll error code 7" failures that occur when installing or extracting large game/application archives (often from installers or repacked game torrents). The feature includes automated checks, guided fixes, and preventative steps.

Sometimes the proprietary setup executable is broken, but the archive inside is fine. You can bypass Isdone.dll entirely.

Always download software from official or trusted sources. Third-party repacks are more prone to this error due to aggressive compression methods.

When RAM runs out, Windows uses your hard drive as "fake RAM". If this is too small, Error 7 appears.