It never fully loads because the owner's site is down and it can't download the textures, you can add the textures manually to your computer and it will work.
https://dl.dropboxusercontent.com/u/19635771/gwent%20textures.zip Uznip these in your: C:\Users\"your username"\ Documents\My Games\Tabletop Simulator\Mods\Images
This is not a mod. Just a stupid save that never fully loads and leaves white empty spots on the board and most of the cards never load either. STUPID. Dont waste your time
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https://dl.dropboxusercontent.com/u/19635771/gwent%20textures.zip
Uznip these in your:
C:\Users\"your username"\ Documents\My Games\Tabletop Simulator\Mods\Images