If you have installed Lumi ViewPoint but the ViewPoint tab has not appeared in the PowerPoint ribbon or disappeared, this could be due to the Lumi ViewPoint not being initialised after installation or the add-in has become disabled.
If Lumi ViewPoint Icon is not run on the final step of the install or the icon not clicked then the add-in doesn't load. Starting Lumi ViewPoint from the desktop icon or from C:\Program Files (x86)\IML\Click Hub\ImlHubHost-ClickVersion.exe should make it appear.
If you have installed Lumi ViewPoint but the Add-in disappears
If the add-in is consistently deactivated then try disabling any other add-in and retesting the software.
Other Add-ins\antivirus that cause conflicts: