How i know that who download and instal the avast using my link.

In recommendations they have given only number that how many people download it
https://my.avast.com/#recommendations

"Your Invitation Status

Once a friend installs avast! via the link above and starts using it, a credit is counted toward your avast! Account. Credit is counted and displayed on the avast! Account with a few hours delay. If you reach the needed number of friends, you can download your free Internet Security license."

But i need more details about the person who download it and instal it using my link. Is there any thing or proof about the person?

This isn’t meant for you to be able to track which people act on your solicitations.
It’s designed to increase the avast user base and reward you for your effort.
If you’re curious who acted on your invitation, ask them after all, they are your friends. :slight_smile: