PC RPG Maker MV: Making expansion packs for your game?

Hello, as a developer of a game in early access called Attack Squad, i want to develop patches, stuff packs and expansions (Such as additional stories) as an optional extra that my (non-existing. X-3) audience they can download for free. I want to make sure it doesn't work by itself and actually requires the base game installed to work. I'm prepared to dip my fingers into a little JavaScript if it's the simplest way possible. If you want a better idea of what the game is you can see it

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Thanks