Adding Compendiums

I have purchased the Mongoose Traveller core rulebook compendium and can launch a game from my Marketplace where it shows up and it adds the compendium like I expect. I cannot add an addon that I own that is the Mongoose Starter Pack (where there adventures I want to run) and if I create a game from the Starter Pack I cannot add the rules compendium, it does not show up as an available add on. I know I am missing something simple but I cannot figure out where I am going sideways.

Okay so as usual, everything made sense after I asked this question. The launcher for the Traveller compendium INCLUDES the starter pack adventures (but not the Marches Adventures, which I can add as normal).

This is one reason I always read what I wrote before clicking on "Submit Post"; the answer is sometimes in my question. :)

It's like my son always tells me when I'm playing BG3, count to three before you tap X. I just needed to read the description of what I bought