What happens next
If that email bought Roster Pro, the key arrives within a few minutes. Check your spam folder too. For privacy, this page shows the same message whether or not the email bought anything.
You can ask once a day. Asking again the same day sends nothing new.
Still stuck?
If you no longer use the purchase email, write to stavros.thalassinos@sthlabs.net with your order number from the Stripe receipt.