Hello everybody bought the TW3 in Digital version, but did not come any cd-key (serial) and nowhere, how do I update the game, or have to ask for change?
It depends which digital version you got. If it's the Steam version, then all updates will be via Steam. I believe that Origins is also handling updates directly. Any other purchase is probably the Gog version, so you should be updating there, and you should have been given a GOG key. Check with wherever you bought it if you're not sure.