Payback said:
You can get either pirated edition (suggested) or here as the first poster said. It is up to you,it is against the rules so I cannot give you link for pirated edition,but you CAN google it. Thank you for your time for joining malwaretips.com
Suggesting to use pirated softwares is also against the rules, take it as a warning.
back to topic:
Avast is one of the best security apps on Android, i used it on my rooted phone.