Go here https://gbc.zorbus.net/steam/index.html
and download the Unlimited Adventures Module Manager + Audio version
The GBC_UA instructions
installInstallation
============

Copy the contents of this folder to Steam's Unlimited Adventures "GBC" folder, which usually is:

C:\Program Files (x86)\Steam\steamapps\common\Forgotten Realms The Archives - Collection Two\games\Unlimited Adventures -ENG\GBC\

Note that the "Tools" folder must be also copied.


Run "GBC_UA.exe" for the module manager version of GBC. You might want to create a shortcut to the desktop, and can then run
it without Steam or the launcher.

When you click "Play selected" in GBC, the game is started, and GBC HUD should show up.


you should be able to download and play custom modules now using the manager
community site https://goldbox.games/
Unlimited Adventures Hall of Fame https://forums.goldbox.games/index.php?topic=321.0




(note)I just got FRUA so I'm not sure if its the best way to download modules but since there is no guide I decide to make one any tips or things i miss would be welcome