Catventurer: The situation is even worse when the bonus game only shows up as a "goodie" in that the bonus game item shows up in Galaxy but not as something you actually own. If you purchase Shadow Warrior (2013), you get Viscera Cleanup Detail Shadow Warrior as a bonus game. However because it is only a goodie item, Galaxy doesn't automatically think you own it.
Well, for goodies which come without their own product entry that's something to be expected. The goodie is not a GOG product and also won't get any updates, it "is as it is", to say so. It's not a game you bought. Also it won't show up in your list of owned games on the website.
Baldur's Gate TOS uses indeed one of the old installers (in my case the file is from 2014, but the version might be older) from before the Galaxy era and does not have Galaxy informations. What you can do here is to go to the Galaxy game page and say "import directory", select the directory where the game is installed. Then it will also be updated with the new Galaxy dll files.
You should not have this problem with any installers that have that 5 digit build number.
This might also work for goodies that have a old GOG installer, but most likely not for those that come packed as zip without installer.
Try writing a bugticket that the installer is outdated.