This is the same one on steam just cheape
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Yes, that is correct.
To elaborate, the Steam version is under contract with Gocha Gocha Games, the distributor of RPG Maker, and Gocha Gocha Games manages the sales in the form of official DLC.
To be honest, the Steam version is only offered in an all-in-one pack, so as a consumer, would it be more convenient to purchase it here? I think so.