Tech issue: playing ME1 on XBX1 help

So, I'm going to make a new Sheploo for a final playthrough before ME:A BUT I was trying to load an old savegame I got from the cloud and get this error.


"Selected Save Game could not be loaded. Downloadable Content mission from Xbox. Module(s) in question: Bring Down the Sky [ENPLES]"

I bought BDTS years ago - not sure what's up.  Anyone know how to proceed? this may be an odd backwards comparability issue.