I have no idea what happend with the download, but i think the size difference is because itch.io will "repack" the game itself.
When you upload a unity game on itch.io with the program "butler" then it demands that it is "unziped" so.. it zipped it itself without my doing.(Of course on patreon i zip it myself)
If everything fails , i think i saw that someone created a torrent in the F95 zones game thread.
https://f95zone.to/threads/bound-in-desire-v0-16-kerni.187018/
(You justs need to search a bit)