@ Zyndstoff,
Unfortunately, the GUI isn't always working the way it should lately and it often asks for the email even if you go through the GUI. Perhaps the servers are busy now with the new version release, so may explain the email delay.
@ AntDude,
You should at least have a 30-day trial before you need to enter your license/key if I'm not mistaken. Can you verify this: Open Avast GUI > Maintenance > Registration or on the main GUI page. Thank you.