ZFR: Which makes it all the more difficult to solve. I think contacting support might be his only option.

Seriously though, Carloen is most likely a spambot and his post was missing a link due to GOG's low-rep-no-links settings. We've had a few that necro old threads with posts that seem relevant at first glance, but with obviously missing spam links. Like so:
https://www.gog.com/forum/general/can_you_gift_games_if_so_can_you_gift_owned_games/post5
(check the date on the OP of that thread)

Wishbone: Nope, the link was there, but it was in the middle of Aynen's post that he quoted, since the forum will let you put links in quotes even if you are not allowed to post them.

juanmachine: As i see it on gta v, i didnt read it anything about witcher 3, may be they will say it later this month or may