Note: If you use a third-party antivirus suite, right-click its icon in the taskbar and pause protection for 30 minutes. Remember to turn your security software back on once the installation successfully finishes. 4. Clear Temporary Cache Folders
The files isdone.dll and unarc.dll are dynamic link libraries used by the Windows operating system to unpack compressed archives.
If you have a , the correct location for these DLLs is C:\Windows\SysWOW64 (not System32 ). SysWOW64 is where 32‑bit DLLs reside on a 64‑bit system.
One of the simplest ways to fix the ISDone.dll error is to run the game's installer with elevated rights. This ensures the installer has the necessary permissions to access and extract the archive files.
Forum threads often recommend downloading a "fix" for isdone.dll or a "download manager" as a solution. This paper argues that this is a misnomer. Instead, the recommendation typically points to: