So i have received my 12-month activation code but as it seems the menu in Avast 15 has changed and i can’t follow the instructions to insert the key ! Thanks , for your help . 
Avast FAQ https://www.avast.com/en-eu/faq.php
FAQ videos https://www.avast.com/en-eu/faq.php?q=video
REGISTER key doesn’t appear it says BUY NOW !
You don’t say what version of avast that you are using, avast Pro/Internet Security/Premier ?
This is for avast Internet Security - it should be similar for the other paid products - https://www.avast.com/en-eu/faq.php?article=AVKB157.
David,
The topic header says Free :
As you already have your activation code for Avast! Free, look here https://www.avast.com/en-eu/faq.php?article=AVKB9#articleContent
- Scroll down and click on “Detailed Steps”.
- There you choose “Alternative method” and continue that tutorial from step 3.
Greetz, Red.
Thanks, confusion reigns - not used to hear Activation Code used in relation to the free version.
@ dntanavaras
If the registration button doesn’t appear in the free version then generally you have more than 30 days left on the existing registration.
The F.A.Q. article is a bit misleading as it talks of “In the Subscription screen, click Register now to open the registration form.” There is no Subscription tab in the avast free UI, it is AvastUI > Settings > Registration > When that opens then it talks about Subscription. Then you will only see a Registration button if you are within 30 dats of needing to register again.