When I click update game in GOG it doesen't download the new update 2.1, please help. Says my game is up to date and I have 2.02 version.

The 2.1 patch isn't out yet.
https://www.cyberpunk.net/en/news/49597/update-2-1-patch-notes

The update just became available. 43Gb download.

yeah, right after I complained :D coincidence?!

Yes

it doesn't download for me :( It's stuck on 3%

Now it damn well should be, but yesterday it wasn't. ^^

I'll snag it when I get home, probably doing a 3rd Cyberpunk 2077 install (1.6, 2.0 and 2.1) to check it out.

I'm in North America, I was able to download the offline installers for the Full Game, PL and the Patch.
It is possible too many people are hitting the servers in your area, leading to connection issues?

GoG Galaxy is also pretty bad, usage experience is 50/50 for me. If I don't have to use it, I won't.

Also in this thread: https://www.gog.com/forum/cyberpunk_2077/21_update_requiring_massive_storage_space

The Patch is requiring 300 Gig of free space to install. Since I am still gaming 1.63, I can't test run the patch to confirm.
edit: if you don't have the 300 Gig free space, I think the workaround is to update using Galaxy.

edit: OFFLINE Installer, download size,

Full Game 104 GB (exe + 27 bin files),
PL 38.5 GB (exe + 10 bin files), and
PATCH 27.9 GB (exe + 7 bin files)

It doesn't download via GOG Galaxy. I always get, that there is no update, but i don't have Version 2.1. Does anybody have the same problem?