If the error persists, physical RAM corruption is likely. Run the Windows Memory Diagnostic tool ( mdsched.exe ) to rule out hardware failure.
How to Fix ISDone.dll and Unarc.dll Error Code -6 (Exclusive)
High compression repacks load large chunks into RAM. If physical and virtual RAM run out, the process breaks.
Always ensure you have at least double the required installation space free on your drive. Highly compressed archives need massive amounts of "scratch space" to decompress successfully.
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Ensure that you have sufficient disk space available. Try freeing up some space or installing the software on a different drive.
If the DLL files inside the Windows system directory have become deregistered or corrupted, manually re-registering them via the Command Prompt can restore functionality.
Decompressing large modern games requires up to double the listed final install size in temporary free space.
Now that we've explored the causes, it's time to provide a comprehensive solution to fix the Isdone.dll and Unarc.dll error code 6. Follow these step-by-step instructions:
Type in the Windows search bar, right-click Command Prompt , and choose Run as administrator . Type regsvr32 isdone.dll and press Enter . Type regsvr32 unarc.dll and press Enter .
Add the installer folder and your Windows Temp folder to your antivirus . 2. Run the Installer as Administrator
