As above. I don't know if it will work or not but its something that Sony tell you to do if there's a problem with DLC.
I have actually tried this i did it after the live stream & sadly it does not including un-stalling & re-stalling 5 times we are all going to have to wait. There is one way that does Work & as a fellow Gamer i STRONGLY ADVISE YOU NOT TO DO & NEITHER DO DTG is to re-purchase your add-ons dtg do know what the problem & a fix is on the way so take there advice & wait its a pain i know but that how it is at the moment BUT DON,T RE-PURCHASE A FIX IS ON THE WAY TO RE-CLAIM YOUR purchase dlc so just be COOL for now