When users try to Install or Upgrade Studio they get the error " Upgrade is not possible" or in case of Studio un-installation
The reason the user was getting the issue was that the uninstallation of the product was corrupted. After removing the Registry keys user was able to Install Studio.
To un-install Winshuttle Studio, first, uninstall it from the control panel. Delete all Winshuttle folders from user system like C:\Program Files (x86)\Winshuttle or C:\Program Files\Winshuttle.
If it still does not work then delete the registry keys.
Below keys need to be deleted depending on the OS that is 32bit or 64 bit.
User will need to have admin access to the machine to make these changes.
Jira https://jira.wswork.biz/browse/WIN-36841 can be checked for the same