Just curious I have bought and downloaded both dlc but today my internet was down for most of the day, When I tried to play skyrim both dlc content was not available however hearthfire content was still present when I loaded up my game save. Is this some kind of security been put in place or have I just messed something up when installing.

Are you playing it on the console you originally installed it on? Or are you playing it on PC?

Playing it on xbox that I originally got it for

i dunno have you played it before your internet problems? because undead nightmare did that to me,but i haven't had any trouble with dlc for skyrim like this

It ran perfecty before I had internet issues ,then both dlc were not found when the internet was down but hearthfire still worked,After my internet was restored same provider,account etc my game saves loaded successfully and found dawnguard and dragonborn content