Hello! Sorry you're having trouble downloading the game.
Unfortunately, I only develop the game itself. Downloads, purchases, accounts, and email delivery are all managed by itch.io, so I can't access or fix those issues directly.
Please try the steps here:
https://itch.io/docs/buying/already-bought
That page includes a "Resend my download links" option, which often resolves this kind of problem.
If it's still not working after that, the best next step is to contact itch.io Support:
https://itch.io/support
I hope you're able to get it sorted out soon!