Installation

Unzip the file,

delete the zip file if you want.

Go to Blender ==> edit ==> preferences ==> file path

In asset libraries tabs, click on "plus" and add the path with the blend file.

Click on "Add Asset library"

Save the preferences and close this windows.

Open a new tab and go to "asset browser", in the list, choose your new folder "Realistic skies"

Installation procedure similar to this video : https://www.youtube.com/watch?v=p68tOGlrMMk

Once you've dragged your image into the scene, all that's left is to position it accurately to align perfectly with your camera. A simple, intuitive, and fast process.

-----------------

If you cannot see the sky through transparent materials like glass, this is normal. Activate the transmission on the sky map (in object menu / ray visibility)