To avoid "isdone.dll" or "unarc.dll" errors during the actual installation:
Assassin's Creed Mirage does not currently have a repack from because the game uses Denuvo DRM assassins creed mirage fitgirl repackpart08 better
Always check the "Limit installer to 2GB RAM" box at the start of the setup, even if you have 16GB+. To avoid "isdone
Here are some technical details about the Assassin's Creed Mirage FitGirl Repack Part 08 Better: you must redownload that specific part.
Right-click setup.exe and select "Run as Administrator" .
Run the Verify BIN files before installation.bat file included in the download folder. If it shows "CRC mismatch" or "Missing" for any file related to Part 08, you must redownload that specific part.