I wish devs would release abandoned game for free use, that way someone else can continue it. This has so much potential for earnings or simply as just a hobby..
Apologies for the late reply, but all of RMMV/RMMZ code is fully open-source. It's literal JavaScript (engine core and plugins) and JSON (which any user can mod to their liking) unless of course it was changed for a production release (usually the case for bigger projects where teams might get paranoid, but by design for RPG Maker, all forms of obfuscation are instantly defeatable).
You do
not need RPG Maker for this unless you want a fancy project GUI with maps, events, etc. This is not true for the older RPG Maker engines as they used pure
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and RPG Maker XP and older (if I recall correctly) did not have external plugin support. If you need the fancy GUI, all you only really need technically is a
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and the engine core.
(I'm also glad to learn that Zenkuro is fine and didn't fall for the "let's exploit those kind and lazy patrons" scam scheme.)