First, the shirts:



Download all 5 (590K)
Now Capp:
Capp is not a complete, playable Sim. He is a packaged BodyShop Sim. I just liked his face in BodyShop and saved him off!
To use Capp in your game, Create a Family, Add a Sim to your new family, set the gender to Male, then click the import button (looks like 6 little Sims, next to the Random (dice) button). Capp contains no custom content.
Since no one has reported any problems with Bryce or Taylor, I assume there are no requirements to use Capp.