If your operating system has corrupted system files, Windows might fail to utilize its own DLL files properly.

To minimize the chances of seeing the isdone.dll error on future repacks, adopt this pre-installation routine: Turn off Windows Defender/Antivirus real-time protection. Run the installer launcher as an Administrator.

Avoid installing games into folders with long names or non-Latin characters. It is best to install directly to a short path like C:\Games\ . 2. Manage System Memory (RAM) and Virtual Memory