Unarc.dll Returned An Error Code 11 Windows 11 Today

Windows 11 may run out of "virtual address space" when extracting large archives.

Click Set → OK → Restart your PC.

Note: Use higher values (e.g., 16 GB max) if you have less than 8 GB of physical RAM. unarc.dll returned an error code 11 windows 11

Several factors can lead to the "unarc.dll returned an error code 11" error on Windows 11: Windows 11 may run out of "virtual address

Some older installers have compatibility quirks with Windows 11. Click Set → OK → Restart your PC

The error message “unarc.dll returned an error code 11” typically appears during the installation or extraction of large compressed files (most commonly games or software distributed via Repack setups). On Windows 11, this error indicates that the unarc.dll dynamic link library—responsible for decompressing ARC archives—failed to extract a file due to data corruption or memory addressing problems. Error code 11 specifically points to a data integrity failure (CRC mismatch or corrupted archive header).