CANNOT FIX ISDONE.DLL PROBLEM FOR CODEX INSTALL, HELP!!!

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I have tried multiple YouTube videos, reddit posts, changed ram settings, placed an ISDONE.DLL File and the UNARC.DLL file in sys32 and syswow, I am very very unsure what to do from this point on, I've been out this for 6 hours straight, if anyone can help me figure this out I would be so grateful!