An error occurred when unpacking, Unarc.dll returned error code -1, ERROR: archive data corrupted (decompression fails). The error code may vary, but the only button you can see is – OK.

You can successfully fix An error occurred while unpacking; Does not match checksum, Unarc.dll returned Error Code 12 by following these suggestions.

If your PC is unable to handle both criteria’s, then the system will show up isdone.dll error and stops the installation process. Here you can see how the isdone.dll appears. An error occurred when ...