yeah... turns out there's no RTP since MV bundles the shared files with the game. So it's all dev-speak and without learning to code in MV/javascript, i'm never gonna figure it out. sucks, unfortunately.
there was another popup about a MV file that indicated an outdated file which may have thrown off my sleep addled brain, but the invalid error i have no knowledge in MV how to help with, so i guess i'm stuck with just.. .being unable to run the game.
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Was it about an older/newer version of nw.js? Something about user profile?
Go to %LOCALAPPDATA%
Delete the nwjs\ folder (it's up to you if you decide to make a backup or not)
If you also see a folder named KADOKAWA, go into that, then to RPGMV (this may not be here since you don't have RPG Maker, but it could be because it's possible that maybe it puts the folders there when you run an RPG Maker created game. I don't know for sure)
If so, then delete the Web Data and Web Data-journal files
If you don't have those files, then deleting the nwjs folder will probably resolve it although from all reports I've seen, it does not have any effect on the game.