Put The Files Date, Sound, & Scenario  in  C:\SteamLibrary\steamapps\common\STAR WARS - Galactic Battlegrounds Saga\Game
The Mod need you to install the game to play
you should buy the game Star Wars Galactic Battleground before install the mod here the link to buy, it's only 5 dollars 
https://store.steampowered.com/app/356500/STAR_WARS_Galactic_Battlegrounds_Saga/