If I buy it now and there is a new version later, do I have to buy it again?
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Yes, when a new version is released, you need to purchase it again to get the latest version. This may be different from the usual way of buying games, but for games that are still under development, it's not appropriate to charge the full price. Therefore, we've continued with a patronage model similar to Patreon, where you can get updates at the same price on Patreon.