this isn't rly an issue that the game dev can fix, it's a challenge with the downloading rather than the game files, but you might find more help at https://itch.io/board/10023/questions-support. If you have a vpn, turn it off. the server for your region might be processing a lot of requests, so try to download during weird hours or it might be reliability issue that you'll have to wait a couple days to get fixed.
you can also try clicking this button, check the box that says 'enable alternate download mode'. if none of this helps, i had a lot of google hits for 'itchio failed network error'. also there's a web port now so you dont need to download! https://brianna-lei.itch.io/butterfly-soup-2-webandroid-ports