Yes, FileLocator Pro switched to using MSI based installers from version 6. Upgrading from versions prior to version 6 requires first separately uninstalling the old version.
The program that actually produces that message is an uninstaller helper EXE
C:\Program Files\Mythicsoft\FileLocator Pro\uninst_flp.exe
The helper app looks to see if the folder
FileLocatorPro exists in the user's local app data folder (
I was going to propose that you could try deleting that folder before uninstalling but unfortunately that doesn't work. The only real solution is to delete the helper app
uninst_flp.exe. It's not perfect because it will leave a few registry options but that won't be a problem if you're going to be installing a new version anyway.
Upgrading FileLocator Pro v6 (or higher)
Installations of FileLocator Pro version 6 and higher can be updated in-place, ie the installer takes care of uninstalling the previous version.