I think you can unistall FH deleting all the files and the app with these steps.
1 Click Start.
2 Click the gear icon, to open Settings.
3 In the Settings window, click Apps.
4 To find the app you want to delete, type the name of the app in the search box.
5 Click on the app name to open the related options.
6 Select Uninstall to remove the program.
If you deleted all the files completely, that is like unistalling it, just download the new FH and patch and you're done!