He can only download version 0.5.,How to get off the version after that.
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The game is still in active development. Currently, itch.io only has version 0.5. The new version 0.6 is currently exclusively available for the supporters on Patreon. In the future, version 0.6 will also come to itch and the Patreon Supporters will get version 0.7 etc.
For the time being, there will be a major update to the game at least once a month.