On a fresh GOG GALAXY installation, in the main view "recent" you should see a giveaway banner on the top, you can claim it there. If you have GOG GALAXY installed already and don't see the banner, you can uninstall, and then install it again from https://gog.com/galaxy Please note that uninstallation will cause you to have to reconnect your integrations, add installed games again ("add games & friends" -> scan... - Source: Reddit / over 1 year ago
Update: 2.0.40 has a fix for missing games. Can be force-updated via gog.com/galaxy installer. - Source: Reddit / over 1 year ago
Update – all below problems are solved in 2.0.40 which can be force-updated by using the installer from gog.com/galaxy. - Source: Reddit / over 1 year ago
Try using GOG GALAXY installer from https://gog.com/galaxy , it should update your currently installed client to newest version. You can try reinstalling in case you already have the newest one. :). - Source: Reddit / almost 2 years ago
Do you know an article comparing GOG Galaxy to other products?
Suggest a link to a post with product alternatives.