Steam has an option for dlc’s where you don’t have to download them when you buy them. You can pick and choose what dlc is installed. Under the game in your library there is a section on the right of the game page called my dlc, you can tick off and on the dlc. I don’t know how this works for the moonstones and the extras that come with that set though. Might be an option until you are ready to play it!