Come on, EpicGames have released way messer demos including UE3 and early UE4 demos. They even released the full assets of multiple games (paragon, etc). That’s clearly not the reason. Remember this is a 4 years old demo so man power/ resources to release it is clearly not the reason as well. In a live-stream last year developers confirmed it will not be released and they don’t know why that decision has been made.