it doesn't get through the download. it gets about 75% of the way through and stops, says the download failed and next to where it says "failed" there is a "- forbidden"
i've got a similiar (or the same) issue as MadHatter has, I press download, it starts downloading but at either 40.7 or 66.7 MB it'll stop downloading, and a few minutes later it'll fail and say forbidden.
Same thing all over itch.io, games stop at the same % every time you download it and just stops downloading, then a while later says it failed. This is itchio having an issue they are too lazy to fix. Yell to itchio about it until they fix it already.