Yes, thanks to Avast for continuing to help the legacy OS users!
Theoretically, Avast 8.0.1506 and above is supported. I was kinda surprised how many Avast8 users chimed-in when the update system went buggy.
BTW, the fix worked for Avast5 and Avast7 also. These I still use with some builds on my Win2K Pentium 3 machine as they tend to use the OS resources less: Every bit helps when the machine is 550Mhz and limited to 256MB RAM