As the title says, I want to know how to remove a deprecated game from my library. Itch.io has had problems linking patreon updates to the main library and it leaves a deprecated block that I can't seem to remove. It just clutters up the library, and as the error happens more often, it is creating repeated instances of this.

There is no way to remove things manually from the 'Things you own' library, so you can only contact support and see if they can do it for you: https://itch.io/support

You can also add a topic in 'Ideas and Feedback' to report the bug if you like: https://itch.io/board/580406/ideas-feedback

Yes. Hiding things from library would be much appreciated. (Removing paid things would be a bad idea, but hiding them into a hidden folder would work. They should copy that feature from Steam.)

The problems with Patreon integration should be dealt with, as it sounds like a bug. But the question is, when.