since I have the same problem as of our friend luieg1, I tried to compare some avast files in:
1- my PC that can update (running Avast4 pro),
2- my friend's PC that got 'server down' error (running newly installed Avast4 Home)
Here is the first file... setup.ini
Good, on XP SP2 (Avast4 Pro)
-------------------------------
[UpdateSummary]
UpdateStartTime=76540309
SetupOld=418
PrgOld=418
VPSOld=276225
PartsWanted=0F000000
Server=download2.avast.com
IP=66.98.252.36:80
DldFiles=3
DldBytes=30
DldTime=11576
LastError=536870913
False, on Win ME (Avast4 Home)
----------------------------------------
[UpdateSummary]
UpdateStartTime=3370616
SetupOld=418
PrgOld=418
VPSOld=271363
LastError=1223
PartsWanted=0F000000
Are the missing lines normal?
By the way, 'servers.def' are identical in both PCs.