You can download the unofficial patch here, which makes it compatible with multiplayer whether you’re using the GOG or Steam versions. When Battlefront 2 was updated, it disabled a lot of the mod’s features, but thankfully there's now a fix. The Galactic Civil War and Clone War eras also get new units and heroes, as well as a nifty feature that changes the type of Clone Trooper you’ll see depending on the map. Not just content to introduce lots of additional maps and modes, it also tackles the Knights of the Old Republic era, chucking 20 heroes and 30 units from BioWare and Obsidian’s RPGs into the mix. The Conversion pack is absolutely massive. Last week, Disney brought back official multiplayer support for the Steam and GOG versions, and it looks like this has reawoken the mod scene a little bit, with Star Wars Battlefront Conversion pack - it adds 25 maps and five extra game modes - getting an update to make it work with the official multiplayer. In the meantime, there’s still the much-loved original Star Wars: Battlefront 2.
While the Star Wars Battlefront 2 beta was a lark, the full game is still a month away.
