When trying to uninstall Space Manager via the Quest Installer, the checkboxes cannot be selected and the buttons cannot be clicked. There are times that the Quest Installer is able to proceed but hangs indefinitely and had to be killed via Task Manager.
1. Rename the C:\ProgramData\Quest Software\Quest Installer\LocalManifest\LocalManifest.xml file to LocalManifest.xml.old.
2. Now run the SpaceMgrCMOSetup.exe and install Space Manager 7.5. This will overwrite the existing 7.5 installation and create a new LocalManifest.xml file.
3. Once install is completed, launch Quest Installer and uninstall Space Manager 7.5.