You don’t get an order summary with the free version.
I don’t expect you would get any confirmation/communication when you install the avast free version. I didn’t that I can recall, but that was almost 14 years ago.
In order to post in this forum you would have to have registered, that would I believe also have created my.avast.com avast account. Try typing the my.avast.com into your browser and you would have to sign in for that, use the same credentials you did for logging in to the forums. Did that work ?