Yes, I am still sick, and I still sound like crap. Enjoy LoL!
Fantasy Grounds: https://www.fantasygrounds.com/home/home.php
You can do everything in this tutorial using only the ‘Free Demo‘
That is where your FGU files are probably located. If that is hidden, have a look at this guide to show them.
You can sell FGU mods on The Forge or DMsGuild.