Once you sign up for Free Avast Account or if you have existing account, then you can login to that account. Login to Avast Free account to synchronous license
If you want to know about which license key is currently being used with the Antivirus then click on the dropdown ∨ icon, which is available on the right UPGRADE NOW button. Here, under the Licenses on this PC heading you can check the Avast Antivirus Expire time. Now, you’re in Avast Antivirus My licenses section. Open Avast Antivirus, take mouse over the Menu and choose the My licenses option. To check Avast Free Antivirus, Avast Internet Security and Avast Premium license status. How to Check Avast Antivirus License Status?