How to fix unarc.dll error 11
There are several ways to fix unarc.dll error 11 in Windows:
The solution is to redownload the file, but first disable your antivirus.
Find an alternative to this software. Look for earlier versions or other download sources.
Install two or three archivers with the best features: WinRar, WinZip, 7-Z.
Check if you have enough space on your hard drive. If not, uninstall all unnecessary programs.