i cant update
1. You have an "edit" button which would have been more sensible than double-posting.
2. You could also have replied to your own message to add that you're on windows.
3. There are at least 3 storefronts you could have bought the game from. Assuming you're on itch.io (since this is where you're posting), the game doesn't auto-update, you have to go to the top of the page and download the up-to-date version.
4. The latest update has removed features from the itch.io version, flagging it as "unsupported." Assuming Steam is an option for you (it isn't safe for some of us), the download page on itch.io also includes a Steam key.
If you scroll to the very top of the page, like I already said, not near the bottom of the page where there's a "buy now" button it should show a banner with "You own this game" and a download button. If it doesn't, you didn't complete the transaction, you refunded the game, or you're logged into a different account.
It has to do with the fact that the person I was commenting to had posted 2 messages in a row, one asking for help and the other, separately, listing their OS. Which is directly relevant information for the first comment, so would be better edited into that comment or at least added as a reply instead of a separate comment.