Checkout confirms the payment, then the license is sent digitally. The message goes to the email you used to pay. Timing depends on the payment method and on any review the checkout runs. Card payments are often quick. A few methods take longer. Watch the inbox and the spam folder before you assume it failed.
Save that email. The order ID is what support uses to find the purchase. Do not buy a second plan while the first email is still missing. If an hour has passed and there is still no mail, write to support with the payment receipt, the time you paid, and the address you used. The license is for one person. Do not forward it.