Would using an launcher / updater (in this case Redlabs Update Utility) be alright? Also, would anyone even bother with the extra wait time of a launcher? (you have to initially download it, and then it has to download another file)
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It's allowed in the jam but in my personal experience it would mean that almost nobody would play it. The maximum amount of effort people usually go through in order to play a game is downloading and double clicking it in their downloads folder. Even that can be a big ask sometimes compared to playing it right in the browser.