I'm guessing this is external download because the size is too big for itch.io?
You can make split zip files to keep file size under a certain size. I think split zip files would work with the itch client too (it can't extract rar).
It would be nice to be able to run it through the itch client because you can automatically see when there's an update if you have a game installed. Plus that would make it easier to run on a Steam Deck (most games on itch that can be run through the itch client will work on a Steam Deck).