Service Desk support had more info like possibly needing "msiexec /x Touchpaper.Console.Main.Installer.msi ENABLEEXEC=1". It seems that 7.5's installer wasn't ... perfect. Uninstall can be a issue as I have seen. There can be issues because the user that installed may need to be the same that uninstall. Even if 7.5 is removed with the 7.5 installer, 7.7 may not install. So far my best results have been installing 7.7 as myself manually by running the 7.5 setup.exe. I say best because even that does not work at all times. My LDMS admin took a VM and installed 7.5 then could not uninstall 7.5 and 7.7 would not run because 7.7 tries an uninstall and fails.
Support said that these issues only apply to 7.5, all newer versions seem to be working with no issues. 
A few articles support suggested: