Remove features from site(s) that are no longer available in the SharePoint farm

Sometimes, if a SharePoint solution is removed from a SharePoint farm, the features that were active in a site from this solution will still persist. This may cause upgrade or migration issues, most commonly when you run the SharePoint Product Configuration Wizard.

!Make sure to have a full back-up of your data before proceeding with these steps!

How to remove missing features from your site(s) and content database(s) on SharePoint 2010, 2013 and 2016:

1. Download the FeatureAdmin program (https://github.com/achimismaili/featureadmin/tree/master/Releases/3.0.4).
2. Extract the zip (or download the executable) to your SharePoint Central Administration machine.
3. Start the application "FeatureAdmin.exe".
4. The application will automatically gather the information from your SharePoint farm.
5. Check if the application has discovered your web applications etc. in order to proceed. You should not see the word DEMO in the application title (top right).
6. Once loaded correctly, go to the tab "Cleanup" which you can find on the right side of the screen.
7. If the application can find any missing or incorrect active feature, it should show this in the table with the feature title "Faulty, orphaned feature".
8. Cross-check these features and see if these are indeed features that are missing from your farm and can be disabled.
9. Click on the icon "Clean up (deactivate) all faulty features in the farm" which is the fourth icon.
10. Once completed, click the option "Reload farm" in the top left to check for more missing features.