Panama, download FreeGST client (SWBF2.exe) directly from this link
http://freegst.org/swbf2/client/BattlefrontII.exe The instaspawn download you see is the server file.
The "2nd" option someone was speaking of was GameMaster, which is a similar GameSpy replacement option to FreeGST, many people are using GameMaster, and there are many servers on there, and those who run the GameMaster master server are manually adding SWGO (and other) game server IP addresses, so they will currently have more servers listed on their master server (GameMaster), maybe FreeGST can do this also in the future.
For FreeGST or the other option, all you do is put the new SWBF2.exe that you download, in your Star Wars Battlefront II/GameData folder. You can actually put both master server replacements in your folder if you wish. You can name them anything for example "SWBF2-FREEGST.exe". But to run this, you must make a shortcut to this particular file, especially important for Steam users, and then start it from that shortcut.
Hope that helps.