how can Register free Avast 1 year license offline v17.3.2291

[system]

how can Register free Avast 1 year license offline v17.3.2291
i have license key free 1 Year but cannot found where i insert my key

http://s10.postimg.org/qdscdo6qh/image.png

[Asyn]

Licensing gets reworked, see: https://forum.avast.com/index.php?topic=198923.0