While Disney and GOG figure things out, dive back into the campaign or mess around with mods on a separate install. Note that the retail and console versions are not supported in this multiplayer update, though other connection types from before remain available.
They’ve turned to both the Steam announcement thread and GOG’s forum to air their technical issues, which range from freezes to outright crashes when attempting to access multiplayer. However, it seems that they’ve underestimated the response as players are swamped with connection problems. There’s even cross-play support between the Steam and GOG Galaxy clients to maximize user population. DICE are addressing some of these complaints for their sequel but, till then, this is what players are flocking to. It’s certainly different from the 2015 iteration, since classic Battlefront II had more maps, higher player counts, a campaign, and far more infantry and vehicle types. If you have a digital copy purchased through Steam or GOG, you can now hop back online via the classic server browser to see what the fuss is all about.