Keep in mind this is extremely simple script. I just check if the Avast UI executable exists, if it does not I copy the installer to the local machine, then run it. I prefer running it locally as to over the network just in case of interruption mid install but I would guess it would be fine without the added step.

If Not Exist "C:\Program Files\AVAST Software\Avast Business\AvastUI.exe" xcopy \\smdk\shared\Avast\avastclient.exe c:\AvastInstall\ /d /y
If Not Exist "C:\Program Files\AVAST Software\Avast Business\AvastUI.exe" c:\AvastInstall\avastclient.exe