See title. Got it all installed, though fair warning, the Rowlf costume seemingly can't install. It claims to have succeeded, but no matter how many times or in how many ways I do it, it's still listed as not installed. All the others work fine.
I do think it'd be nice if we could just have a "press square to install all cross-buy DLC" option, rather than having to "purchase" them in groups of 16 and install them one at a time by hand.