A clunky little function to if the script is running on a computer which has “at least” a particular Windows Version.  So if you wanted to allow the script to run on Windows 8 or newer, you would use (Test-WindowsVersion 8).  The Do/While code is just a loop from 1 to 11 to demonstrate it.

function Test-WindowsVersion {
  PARAM (
    [parameter(Mandatory=$True,Position=0)] [int] $MajorVersion
  )
  $wv = Get-CimInstance -Namespace root\cimv2 -ClassName Win32_OperatingSystem | Select-Object -ExpandProperty Version
  [int]$wv = $($wv.ToString()).Split(".")[0]
  if ($wv -ge $MajorVersion) {
    Return $True
  }
}

$i = 1
do {
  if (Test-WindowsVersion $i) {
    Write-Host "Windows $i or newer"
  }
  else {
    Write-Host "Older than Windows $i"
  }
  $i++
} while ($i -le 11)
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