Title says it all. To those who are using GOG Galaxy and cannot figure out how to get the DLC ingame. You need to navigate to the Witcher 3: Wild Hunt page in your library. Then in the drop down menu found on that page select "Configure". On the left side it will then show owned DLC, you simply click the check boxes for both and it will install them. Then you can enjoy them ingame (after buying them from a merchant of course haha).
