who knows, im sure it was from deprec. nodes. that wouldnt be so bad, since, UE tells you what ones and what to change. I skipped over this completely and ended up paying someone to build me a working on in 4.13.
Usually when someone (an auther/dev) decides to not update (for months now), its usually a dead project at that point. I wouldnt buy something that isnt supported by the ppl that make it … kinda limits you to only using 4.12 or lower UE as well…