HELP How to get DLC to "install" or be recognized by Horizon

I’ve got Horizon that I purchased from the XBOX marketplace (the $9 special).

I’ve d/l’d 1000 Club DLC from XBOX marketplace and it shows as purchased from inside Horizon. I’ve also tried re-downloading from inside Horizon’s marketplace.

When I try to launch 1000 Club from the menu, it just tells me that I need to D/L it! ARRGGHH! How to I get this DLC to actually “install”?