Dear Customer Support Avast,
I know when invite 7 friend install Avast, I will be one license key Internet Security 1 year. However, I have been 3 people invited you to install, but the system still count as 0. I asked how participation details.
Thank you,
Regards
Please, help me 
Quote from Marcus (Customer Care):
[i]The terms and Conditions states:
General
You must have verified avast! Account
Your friend must install avast! Free Antivirus from the specific link shared from the Recommend section of avast! Account and keep it installed in order to count this installation towards your account
Credit is counted and displayed on the avast! Account with a few hours delay
Friend’s PC must be connected to the Internet, so we know you recommended it
Reward
If you get 7 friends to install and use avast! Free Antivirus you’ll get a free license for Internet Security for 1 PC, 1 year.
The free license is valid from the day you first download it from avast! Account
The free license is prolonged per extra year, when you get 14 respectively 21 friends installations in total
The maximum period for using the free Internet Security license is 3 years
The free license cannot be refunded
We reserve the right to refuse to issue the license in case of suspicious activity on account
If you still have any doubt about this program, let us know by contacting our Customer Care on www.avast.com/support
Kind regards,
Marcus Taveira
Customer Care [/i]