Is there any chance to get one?

Do you need one (I've not tried multiplayer with the GOG version).
Also, if you do need one then you need to raise a support ticket to GOG support requesting one. It may take them a few days to send you one though.

Yup. CD-Key is needed in GOG version for multiplayer.
I send ticket few days ago. No any responce... :/

You can find one of the GOG staff here on the forums and send them a message. There is an active GOG staff member in the "What is this movie?" thread in the General discussion forum, and they show up in other threads too. For ease of finding them they post with blue text.

Write to support here too: support@gog.com.

I would love to know this too

also steam sales on Farcry was cheaper, and probably they got the proper CD key.

Nevertheless, I don't think there would be much players around at ubi.com

well, sent a message through their form couple of days ago (don't really remembered when_ and I've received them now.... props to gog.com!

I was wrong.

Multiplayer is pretty much very well and alive for 7 years old game

Too bad not on my side tho, ping is damn crazy. On the crowded ones they goes up to > 400ms

Maybe you guys on western hemisphere would have better luck with this game's MP.

Cheers!

Great to hear.