Installation:

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

Limitations: The Add-on has in the Standard Type and Standard Simplified Type one issue if the object moves too near to the mesh's surface, it begins to jump outwards.

The Normal Type has an issue with sharp edges because it uses the Normal of every point, which does not depend on the object's position.

You should disable the GPU Acceleration in Preferences -> Viewport -> Subdivision -> GPU Subdivision. If you want to use Subdivisions with Geometry Nodes. (Current Limitation through Blender)