Installation:

1. Download the ZIP
2. Go to Preferences
3. Add-ons
4. Install
5. Select the ZIP-File
6. Activate the Add-on

Suppose you want the effects of the Cutouts to get updated in the viewport. You must press the Live Update Button in Cutout Effect Section, and to have the Effect on the whole Render Section, you must press the Render Range Button.

The Apply Modifiers Button makes the Object uneditable, but then you have an Object ready for Export in another Program, faster use in the Viewport and less risk if you accidentally change a variable.

If you have unnecessary edges and vertices you can remove them by going into Edit Mode and going to Mesh -> Clean Up ->Delete Loose and selecting Edges and Vertices.