It seems you are referring to a common error message encountered during software installation or extraction, typically with , 7-Zip , or game/setup installers (like those from FitGirl or other repacks).
Before fixing, know the enemy:
Provide users a compact, reliable troubleshooting feature that identifies, explains, and resolves the common "isdone.dll" and "unarc.dll error code 7" failures that occur when installing or extracting large game/application archives (often from installers or repacked game torrents). The feature includes automated checks, guided fixes, and preventative steps. isdonedll error unarcdll error7 best