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A: Never. That DLL is part of the installer. Deleting it will break Inno Setup entirely.

A: Repacks use extreme compression ratios (like LZMA2 with dictionary sizes over 256MB). This demands more memory stability than standard installers. Conclusion The isdonedll error unarcdll error7 is not a virus or a random glitch—it is your PC telling you that a hardware or configuration limit has been reached. Fortunately, with the 7 best fixes above, 99% of users can overcome it. isdonedll error unarcdll error7 best

Start with the pagefile adjustment and the language path trick (Fixes #2 and #6). These two alone resolve nearly half of all cases. If the error persists, do not ignore the possibility of faulty RAM—test it today. A: Never