Avast 5.0 instead Avast 4.8

Hello !
I’m Avast 4.8 free edition user and i saw that there is now a new version named 5.0
I’d like to change for the new one, but i don’t know how to do : Do I have to uninstall 4.8 before download 5.0 and how to uninstall my old Avast ? (i didn’t find tool to uninstall)

Thanks. Greetings from France !

Try doing a clean install

How to uninstall our software using aswClear.exe: http://www.avast.com/uninstall-utility

You don`t need a key for avast 5 if you register online

see page 8

http://www.avast.com/documentation/quick-start-guide-free-en-ww.pdf

I’ve installed new version instead old version, Restart computer and it working fine.
So I recommended to do Pondus’s step to be sure.
Cheers