It's called bg3_dx11.exe. BG3 doesn't have dedicated servers, one player hosts and the others connect to them. It (obviously) works on LAN, no internet connection required.

It's peer to peer, isn't it? Afaik you can play it on a LAN with no Internet connection

Yes it is, I use a VPN to play on LAN mode with my family all the time from across the country.

Larian are no longer involved with development of BG3:

https://www.ign.com/articles/wizards-of-the-coast-not-to-bla...

EDIT: Updated Link. It seems they've added free patches and won't be working on BG4.

Your article doesn't say "Larian are no longer involved with development of BG3". It in fact says they're still developing it, but won't be making BG4.

The official Larian BG3 Discord server is promoting a mod competition, and they're still adding content, bug fixes, and new features to the game as well.

I've updated the Link with the right one.

https://baldursgate3.game/news/the-final-patch-new-subclasse...

So it looks like they've released free content update and after this is is going to be hot fixes?

That announcement is about BG4 not BG3.