Since this is a , your save data might not be compatible with future updates. "Hot" builds are meant for testing and previewing features. If you encounter a bug, be sure to report it to the developers on their Discord to help them polish the final release!
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The download usually comes as a or .bps patch file. To play it, you need to apply this patch to a "clean" ROM of the original Pokémon Platinum (Version 1.1, USA). Since this is a , your save data