“An error occurred when unpacking. Unarc.dll returned an error code.”
: Check the name of the folder containing the setup files. Ensure it contains no special characters like symbols ( ! , @ , # ), dashes, or underscores. Keep the naming convention strictly alphanumeric. 2. Allocate More Virtual Memory (Paging File)
If you have questions about a or repack that's giving you trouble, let me know: Which game or software are you trying to install? Are you using a FitGirl repack or a different version? What is the exact, full error message you are getting? I can then give you a more targeted solution!
Select , choose Folder , and select your temporary installer folder. isarcextract windows 11 top
Follow these steps in order, from the simplest to the most advanced, to resolve the issue.
This method saved one user hours compared to unpacking each file manually.
This error typically occurs during the installation of large software or game repacks when the installer fails to locate or unpack compressed archive files. Recommended Solutions “An error occurred when unpacking
This manual extraction bypasses the problematic ISArcExtract routine and is often the fastest workaround.
Disclaimer: This article provides general guidance for resolving the ISArcExtract (ISDone.dll) error on Windows 11 and 10. Always ensure you have legitimate licenses for any software or games you install, and download all files from official and trusted sources to avoid potential security risks.
: Sometimes Windows Defender or third-party antivirus software flags the extraction process as suspicious. Temporarily disable Real-time protection in Windows Security before running the installer again. , @ , # ), dashes, or underscores
Go to . Set a custom size (e.g., 8000 MB or more). 6. Install in Safe Mode
: Open Command Prompt as Administrator and run the command regsvr32 Isdone.dll to refresh the library's registration.