Then you can activate your paid subscription to this Antivirus, which is installed on the other PC. If you need to transfer your paid Antivirus subscription from one Windows PC to another, you must uninstall the Antivirus from the previous PC and remove it from your account. However, you cannot use a single license on multiple PCs at the same time.
Transferring an Avast Antivirus subscription to another PC If you no longer use your Avast license on one PC, you may activate the license on another PC and use your product for the remainder of the subscription period.