The installer lacks administrative rights to write files to the disk. Step-by-Step Solutions to Fix IsDone.dll Error Code -1 1. Increase Virtual Memory (Page File)
The (often accompanied by "Unarc.dll returned an error code: -1") is a common installation failure in Windows. It typically appears when you are trying to install large software packages, games, or repacked setups (e.g., from FitGirl, Razor1911, or other repackers). isdone.dll error code -1
Error code -1 specifically indicates that the installation process failed while decompressing or writing data to your hard drive. In simple terms: The installer lacks administrative rights to write files