anybody else having an error when trying to extract it?
Viewing post in The Legend of The Hero of Edoriam comments
Okay, turns out the problem is with the file extracter that comes with Windows (i.e. when you right-click > Extract All...). I was able to extract successfully with Aukzip, which I got from the Windows store.
Also, make sure to copy your Edoriam/www/save folder to the new version to keep your progress.