Task: Roekaar Manifestos missing manifesto

I had the same problem! If you have already finished the quests "overgrown" and "freind or Foe" and you are still missing a datapad. Go to the northern rokaar camp to the right of the big gap and directly above the right most forward station, on the top of the minimap. Kill all Rokaar, then retrieve the data pad above one of the crates. It is key that you nutrilize all hostiles first.