127.0.0.1 localhost ::1 localhost Save and close.
Share your experience in the comments.
Avira’s hosts file protection is a good thing—it stops one of the oldest tricks in the malware playbook. Just don’t assume every block is an attack.
Your Activation Key is invalid
There are a couple reasons why this might have happened:
1) you don’t have an activation key and entered a fake one
2) you entered the wrong code
3.) You didn't sign up properly
Please double-check that you have downloaded your activation key according to the instructions in the tutorial video.