I bought the game 150 days ago and when want to download the full latest update im not alowed but only public demo is there.
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If you try to download it from the devlog it doesn't let you download the paid version. You need to go to the main page of the game and hit download at the top below where it says you own this game or go to to your library ( to find it press the dropdown arrow next to your name at the top right and under explore press "My Library") then you should see a list of your owned games.