If we get the version from Patreon, will we have to buy the newer versions when they're released?
That depends on when a new version gets released. Patreon bills you every month. If, for example, you buy the Patreon version now, you will immediately get access to the full version. If a new version gets released within this month span, you will also get that version. However if a version gets released after this month and you don't decide to continue your subscription, you won't get the newer version