Intended for new customers only. Pretty sure you can use another email once the 90 day trial is up for you.
Italian link, simply enter your email in the first visible text box and hit the big green button. You'll get an email with details on your 3 month trial. No payment details required.
Avira Prime includes all Avira products, such as Antivirus Pro, Phantom VPN and Password Manager Pro. Works on all devices.
Seems to be a very good product, has perfect scores on AV test:
AV Test comparison of anti-virus software on Windows (April)
AV test comparison of anti-virus software on Android (May)
AV test comparison of anti-virus software on MAC (March)