Hello. Unfortunately, I didn't have it in the downloads folder. I tried it again with the folder "The First Greek Odyssey" sitting on my desktop and running the game from there, only to get the same error. However despite this profile error, I was able to save the game thus it is looking more like a nuisance error.
Viewing post in The First Greek Odyssey comments
Yeah I think you are right. I checked the forums help pages and found this
"It means that at some point you or other users of your computer have installed/downloaded and launched a higher version of NWjs than RPG maker MV uses. It's a completely irrelevant message though and nothing bad happens, since for important settings there is a package.json file inside the folder.
I see this message all the time ever since I downloaded NWjs v.0.30, but no actual errors occur."
I got it part of that massive bundle so only got as far as doing a preliminary check to see if it works and I like the game. I liked what I saw enough to let you know about the error.
So long as you were not aspiring to make the next Wizardry 4 in terms of game difficulty, I can deal with however difficult it is even though everything I know about ancient Greece is found in various myths. :)