Confused about Totally Free

When I downloaded Avast for totally free on basic in 30 days ago. But It keeping remind me when it near expire and offer me to pay to activation. Should I ignore it and it will continue totally free?

The free version is and will be free. Still you have to register it.
https://support.avast.com/index.php?_m=knowledgebase&_a=viewarticle&kbarticleid=612

You don’t have to pay, but you do have to register the free version before the end of the trial period, that will register you for a year, at the end of that year (14 days before) you will start to get renew the registration notifications, again you don’t have to pay, just opt for a renewal or the free version. You’re good for another year.

I just realized, I’m on Internet Security trial mode, I must be downloaded wrong one.

Well you have 30 days unrestricted trial, at the end of that you would have to uninstall it and install the free version if you decide not to purchase.

You can download the free version here: http://files.avast.com/iavs5x/setup_av_free.exe