In particular, if you've lost access to the old E-mail, you can have it re-sent (along with all your other itch purchase emails) using this webpage: https://itch.io/docs/buying/already-bought
Unfortunately I'm not sure we can do this on our end.
Our EULA allows you to install and use imitone on two computers at a time, so you won't need an additional key. It's also OK if your laptop and desktop use different operating systems (eg, MacOS vs Windows.)
