I get isdone.dll error while installing Assassins Creed: Unity. How to fix it?
If you have issues with the installation, locate the isdone.dll (usually where the installer is) and copy the files to C:\Windows\system32 for 32bit or C:\Windows\systemWOW64. Reboot the PC, then try installing the game again. If you still have issues, right click the setup package and go to Compatibility. Choose Windows 7 or Windows, then launch the installation again. It should work this way.