Deactivate add in

1. Start PowerPoint
2. Click on the "Tools" tab
3. Navigate to "PowerPoint Add-Ins"
   
4. Uncheck the "empower-slides" checkbox and confirm it by pressing "Ok"
   
5. Close PowerPoint

Delete the add in

1. Start the finder
2. Click on "Go" --> "Go to Folder" in the toolbar
   
3. Navigate to the folder:  /Library/Frameworks
4. Delete the "empower_slides.framework" folder
   

Reinstall add in

1. Hold the "Option"- key and click on the empower sync icon to reinstall the add in.
   
2. Check if the empower_slides.framework does exists
3. Add the add in to PowerPoint
4. Restart PowerPoint