Your download manager might have cached a bad file. Do not use "Save As."
But what does "Error Code 14" actually mean, and more importantly, how do you fix it? how to fix unarc.dll returned an error code 14
Few things are more frustrating than waiting for a large file to download, only to be met with a cryptic error message during extraction. If you are seeing the message "unarc.dll returned an error code 14" (often accompanied by "-14" or "ERROR: archive data corrupted"), you are not alone. Your download manager might have cached a bad file