To be clear when you open impluse you dont see any of the items you have bought?
When you start impulse let it run for a few seconds till the bottom left pop open tab finishes validating products.
On top click on "My Games" Look for the game(s) there.
If not there click on the very top left corner stardock icon (Blue circle with an white planet with a ring and a Blue S in it)
In that pop open tab you can register games and preferences as well as a couple other things.