Register to get your key
Download Avast RPM, right click> open with Kpackage> install
At some point it'll ask for the key, I don't remember if its during install or the next step I list....
Open Konsole and type avastgui, hit enter, update Avast
To add Avast icon to task bar (kicker, panel) right click on kicker> unlock> Add application to panel> Add Non-KDE application.
Now to configure the Avast launcher:
Button title= Avast
Now next to the Button title you'll see a box with picture, click it and icon data base will popup, choose the Avast icon, click ok and it'll be in your kicker panel.
You should be set to go