Few things are more frustrating than spending hours downloading a large game or software archive (typically a 50GB+ ISO file), only to see the installation screech to a halt. You click "Setup," the progress bar starts, and then—disaster. A pop-up window appears with cryptic red text:
A: Never. That DLL is part of the installer. Deleting it will break Inno Setup entirely. isdonedll error unarcdll error7 best