not sure how hard it can be.
in windows world, version string is a 4-piece string.
so, checking for first, second, third and finally forth should perfectly reveal which is never.

Code:

$NAVHome = ReadValue($RegPath+'HKLM\software\INTEL\LANDesk\VirusProtect6\CurrentVersion\', 'Home Directory')
$NavExecutable = split(GETFILEVERSION($NAVHome +'\vpc32.exe','ProductVersion'),".")

if ubound($NavExecutable)<3
 RUN "\\$server_name\vphome\clt-inst\win32\setup.exe /S /v/qn"
else
 if 10>$NavExecutable[0] or 1>$NavExecutable[1]
  RUN "\\$server_name\vphome\clt-inst\win32\setup.exe /S /v/qn"
 else
  if 0=$NavExecutable[2] and 394>$NavExecutable[3]
   RUN "\\$server_name\vphome\clt-inst\win32\setup.exe /S /v/qn"
  else
   if 0=$NavExecutable[2] and 394=$NavExecutable[3]
    RUN "msiexec /update \\$server_name\netlogon\sav396.msp /passive /qr /norestart"
   endif
  endif 
 endif
endif
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