itch.io does not offer the option to limit the number of times a file can be downloaded
There are options that read like this. Obviously. I think op might talk about the option to sell a limited amount of a thing. Rewards or whatever. Also there is talk somewhere about limiting the keys one can give away. But even after asking for clarification, op did not really clear things up and seems to still think there is a thing that can be limited.
Pricing options on itch are confusing sometimes. And please fix already that you can increase your "payment level". So called individually prices files are a broken concept as it is now. You cannot buy something priced for 10 and later increase your level to 15 to get the bonus item at 15.
It gets worse for bundles and individual tiers and discounts. Also bundles very often do not communicate clearly, that there actually is no bundle discount whatsoever. There sometimes is, but often there is none. I picked the first bundle on sale and it says: "Each item 50% off! or buy everything for $116.85! Regularly $233.85". Half of 233.85 is 116.925, so I guess there is rounding errors with those 15 items ( 15 half cents would be the difference from .85 to .92) and since every item in that bundle is individually at 50% discount right now, there is no bundle discount. Which is not clearly communicated. The wording even implies, that there is a bonus for buying the bundle. "or buy everything for x".
Semantically I take issue with the "or". It indicates an alternative with different options/outcome. But it is the exact same thing for the buyer. Buying every item in that bundle for half price is the same as buying the whole bundle. That a single transaction is better for all parties involved is a given. But if you had a shopping basket, that would not be such a clear advantage.
Anyways, pricing options are plentyfull and the developers know just as much or as little as the gamers about them, as this thread here demonstrates. Misunderstandings should be minimized by clear non ambigous wording. Some developers do not even understand, that they can update their projects without deleting the project.