it is possible some of your browser extensions are doing "funny things" and making you unable to download it.
like it happened to me just now (specifically a "pop-up blocker" one). Try disabling it for itch.io pages specifically - hopefully it works out for you like that.
Kuroe_Nezumi
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Xander the Monster Morpher: Universe Breaker comments · Replied to Llen in Xander the Monster Morpher: Universe Breaker comments
whenever you buy a game from a bundle, unless otherwise stated, the games are only available from Itch. The keys are usually given if you buy the game separate from a bundle (again, unless otherwise stated).
Have checked on other game pages and other people ask the same with that being the answer they're given.