You need to go to the description of this video and click on the google drive link. Then you pick the skin you want and download it. Then you double click to execute it or you can also drag it into the window of the game with your cursor to import the skin(if you have trouble with dragging the file it in on fullscreen or double clicking the file doesnt work, then you can also just put osu! into windowed mode and drag it in from your desktop or downloads folder)
I know that 4 of the skins are basically the same, but these are also the skins I used the most. (and also because I wanted to make it a nice 25 skins instead of 22)
drive.google.com/drive/folders/1dkejZy_TMvd59Ckg0iN55w4BlhZdVFA_ This is where I uploaded all the skins. If you already checked that link then you probably missed it. Just have to scroll down a bit and it should be near the end of the list. (this link is in the video description aswell)