The problem with clearing out all references associated with Poser using 3rd party software is you remove your SN at the same time. The Poser 11.2 update uninstalls Poser 11.1 for you and if you use the default installation, which uses the old SM folders, it retains the SN from the old registry. Unless you manually set up pathways and preferences in an entirely different manner that Poser can't track or determine, installation should be straight forward and trouble-free.