You'll be waiting a very long time. The APK being in a zip file has nothing to do with me (why on earth would I go to the extra step of zipping it up when it only makes things harder for everyone, myself included?) - this is all Itch. For some reason their Butler software insists on zipping things up.
Also, updating isn't "odd" if you do it with a zip file, either. You literally just unzip the file then install as normal. All modern devices should have a file manager capable of natively extracting files, but if you're on a very old model then something like WinZip ( https://play.google.com/store/apps/details?id=com.winzip.android&hl=en_GB&gl=US ) is perfectly adequate.
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I say "odd" a bit loosely here. Since some people won't know where the file unzips to etc. It's why I mentioned if they have a file reader app lol. As for a file manager... I actually had to download one that was recommended elsewhere. And I wanna point out I live in the USA and own a fairly new android so like... unsure if it's as common? Regardless, I hope itchio stops being weird with you and other creators. This issue is at least easy to work with. Some of the other games I wanna update can't due to a conflict with existing package, and idk what that means let alone how to fix it...