New avast! Will Be Compatible With Windows 8.1
UPDATE (2013-08-11): avast! program update version 8.0.1496 is officialy released - check this post 'Update…
If you are still running Avast version 4.8 (Home Edition) or even older, you need to update it. As of today Avast is no longer supporting the old versions which means you no longer receive any support, but more importantly you won’t receive any virus update definitions. That makes your system vulnerable to new versions of malware and viruses, and essentially unprotected.
Even if your computer is not connect to the Internet, we really do not recommend to use Avast v4.8 as you can still get a virus through external media like USB drive.
Avast version 4.8 has been released in March 2008 and Avast kept supporting it for 8 years. Although that’s a very long time in the digital age, there are still some users who are using it. It has a very different and unique user interface, very similar to WinAmp (popular MP3 player at that time).
Unfortunately you can’t use the typical update flow via the program interface. To update to the latest version, you need to first uninstall the old one. To do so please follow the steps below