Have a problem when trying to uninstall and then reinstall Thingworx Platform
I was trying to uninstall the Thingworx 9.1 and reinstall Thingworx8.3 to prepare for a competition. After I uninstalled it and tried to reinstall version 8.3, I received an error message:
"You already have Thingworx Foundation Trial for H2. Uninstall it, and then you can use this installation tool to reinstall"

Then I go to Windows "Uninstall or change a program", but there is nothing there with a name like PTC or Thingworx.
What can I do now?

