Download all WSP From Sharepoint Server using Powershell

$pathName = "c:\WSPFiles\"
foreach ($solution in Get-SPSolution)
   {
 
    $solid = $Solution.SolutionID
    $title = $Solution.Name
    $filename = $Solution.SolutionFile.Name
    $solution.SolutionFile.SaveAs("$pathName\$filename")
}