Sorry for the late reply (apparently I didn't get a bunch of notifications). Is it possible the folder is set to "read only"?
Viewing post in Caliross, The Shapeshifter's Legacy comments
Let's see... Are you logged in as the adminstrator? Anyway, check this article, perhaps one of these solutions is what you are looking for.
https://thegeekpage.com/folder-keeps-reverting-to-read-only/
P.S.
If you have more than one hard disk, try copy/pasting the game's folder to another hard disk, and see if that changes things for you.
I really can't think of any other way to fix this, I am sorry to say. You never played other versions of the game, did you? Did you ever try other RPG Maker VX Ace games on the PC you are using? This seems some weird interaction with your PC, since I don't get reports about this issue from others, but it's hard to say for sure what might be causing it.
I was asking about other games because this was starting to sound like a problem on your PC, and if that was the case, maybe this had happened with other games as well, but if you played other versions, then this is even more confusing. Maybe something went wrong with the version I uploaded here at itch.io? Here is another link:
https://mega.nz/file/BFIh3Dyb#38rcKug-wnOpjLcdFRrSxRtt86w8KSHWaoUGkZ616qI