Replacing trial version with full version

Hi

Can someone confirm - as I can’t find the information anywhere - if I need to completely uninstall the Domino trial version (8.5) before installing the full licenced version? I tried installing over the top - but still get the licence warning. I tried removing the Data directory, installing, running, moving directory back and restarting, but to no avail. The next step is uninstalling the trial then installing the full version, but wanted to check first if anyone’s been down this route before.