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That is weird indeed. It should work fine.

im trying to download it through the itch.io app idk if that may be messing with it? i tried downloading a different tittle from yours and it says the same thing. I can still download other games on the app tho  :o

cannot read property of build? I googled it, And yea it seems It can sometimes happen with downloading from the app, try the website.

I downloaded an app on my computer called Winrarx64 and it will help you download games like these! Hope this helps!