Re: Supernatural Installer Trying to Uninstall Instead

You can remove that entry with ccleaner as well.

Did you also try manually searching if there aren't any files left or entries in the registry ?

See if this thread also helps you: http://answers.ea.com/t5/The-Sims-3/Help-Guide-All-in-one-fix-except-hardware-issues-PC-only/m-p/734448#M36281 where it says Delete game installers

Manually delete everything if above method does not work: https://help.ea.com/article/the-sims-3-supernatural-manual-uninstall

You just need to do it for supernatural.