Hello Leon, thanks for getting in touch with us.
At the moment, only the older Anno games are available via the GOG platform, but we will take note of your request.
Can you let us know why your Ubisoft Connect does not work online, do you use other game launchers online?
It could be an old version of Windows or your Windows Firewall preventing the launcher from connecting to the internet. You may also be unable to launch the game, if this is your first time playing. If so, you will need to connect online once to launch the game and register it with your account, you can then switch to offline mode in the Ubisoft Connect game launcher settings to play offline afterwards.