Can I download the new version for offline installation?
My internet connection is very slow.
You can download the offline installer from here.
avast! free antivirus:
http://files.avast.com/iavs5x/avast_free_antivirus_setup.exe
avast! pro antivirus:
http://files.avast.com/iavs5x/avast_pro_antivirus_setup.exe
avast! internet security:
http://files.avast.com/iavs5x/avast_internet_security_setup.exe