To add a bit of insight to this, sometimes during the mirror update procedure, I see setup.exe in the actual task manager as if it's attempting to run.
Then the mirror.log tails this!:
It seems as if the Mirror update is trying to execute the client setup on the server, and of course it's bombing with the "I can't install on Windows 2003 speil" and failing.
'prod-abp.vpx'...
19.06.2012 13:58:54.000 1340132334 (null) scr: copying setup file 'servers.def'...
19.06.2012 13:58:54.000 1340132334 (null) scr: copying setup file 'servers.def.vpx'...
19.06.2012 13:58:54.000 1340132334 (null) scr: copying setup file 'setif_abp-59e.vpx'...
19.06.2012 13:58:54.000 1340132334 (null) scr: copying setup file 'setup_abp-59e.vpx'...
19.06.2012 13:58:54.000 1340132334 (null) scr: copying setup file 'vps_32-81d.vpx'...
19.06.2012 13:58:54.000 1340132334 (null) scr: copying setup file 'vps_win32-831.vpx'...
19.06.2012 13:58:55.000 1340132335 (null) scr: copying setup file 'vps_win64-4c1.vpx'...
19.06.2012 13:58:55.000 1340132335 (null) scr: copying setup file 'winsys-5.vpx'...
19.06.2012 13:58:56.000 1340132336 (null) scr: copying setup file 'winsys64-1.vpx'...
19.06.2012 13:58:56.000 1340132336 (null) Error:Failure while extracting setup.exe, error code 0x00000005
19.06.2012 13:58:56.000 1340132336 (null) Return code: 0x00000005 [Access is denied.]
19.06.2012 13:58:56.000 1340132336 (null) Stopped: 19.06.2012, 13:58:56
In addition, the Avast.SBC.Service reports this:
06-19 14:23:43,534 [SchedulerWorker3] ERROR Scheduler - Error during server side job execution.
Avast.Sbc.Scheduler.Iface.TaskException: Unexpected unresolvable error in definitions update job! ---> System.Data.UpdateException: The setup process failed to exit within the specified timeout!
at Avast.Sbc.UpdateEngine.Iface.UpdateEngine.BuildIniFile(String sbcServerName, Int32 sbcServerPort)
at Avast.Sbc.UpdateEngine.Iface.DefinitionsUpdateJob.BuildIniFile(Int32 lowerBound, Int32 upperBound)
at Avast.Sbc.UpdateEngine.Iface.DefinitionsUpdateJob.Execute(Job job, IPluginContext context)
--- End of inner exception stack trace ---