Messed up uninstall of DevPartner Studio

My uninstall of DevPartner studio 11.0.3 hotfix 3 did not go well and now my system is mostly cleared of the product but something remains that prevents the 11.0.3 (any version) from installing stating an existing version is already installed.

I even tried setup.exe /x to force uninstall with the same result. I am unable to get DevPartner Studio installed again due to this problem.