Some more info from the setup.log:
11:43:23.000 Started: 16.09.2003, 11:43:23
11:43:23.000 Running setup_av_pro-104
11:43:23.000 Operating system: WindowsXP ver 5.1, build 2600, sp 1.0 [Service Pack 1]
11:43:23.000 Computer WinName: xxxxxxxxxxxxx
11:43:23.000 Computer DnsName: xxxxxxxxxxxxx
11:43:23.000 Computer Ip Addr: xxxxxxxxxxxxxxx
11:43:23.000 Windows Net User: SYSTEM
11:43:23.000 Cmdline: /downloadpkgs /noreboot /silent /progress
11:43:23.000 Part prg_av_pro-104 is installed
11:43:23.000 Part vps-30807 is installed
11:43:23.000 Part news-1b is installed
11:43:23.000 Part setup_av_pro-104 is installed
11:43:23.000 Server definition(s): 4.
11:43:23.000 SelectCurrent: selected server 'Main ASW server'
11:43:23.000 progress thread start
11:43:23.000 progress start - 1
11:43:23.000 progress start - 2
11:43:24.000 progress end - 1
11:43:24.000 progress end - 0
11:43:24.000 progress thread end
11:43:24.000 Err:Other HTTP error.
11:43:27.000 Transferred files: 0
11:43:27.000 Transferred bytes: 0
11:43:27.000 Transfer time: 0 ms
11:43:27.000 Return code: 0x20000006 [Other HTTP error.]
11:43:27.000 NeedReboot=false
11:43:27.000 Stopped: 16.09.2003, 11:43:27