https://github.com/QL-Win/QuickLook/wiki/Differences-Between-Distributions

• The .msi/.exe installer version

1. Exit the QuickLook program.
2. Delete the 3rd-party plugins folder (Such as C:\Users\{YourUserName}\AppData\Roaming\pooi.moe\QuickLook).
3. Unstall the Uninstall from System Settings.

• The .zip/.7z package

1. Just delete your extract folder.