Beginning with PowerShell 3.0, you can download and update the offline help documentation using a single cmdlet.

Update-Help

To update help on multiple computers (or computers not connected to the internet).

Run the following on a computer with the help files

Save-Help -DestinationPath \\\\Server01\\Share\\PSHelp -Credential $Cred

To run on many computers remotely

Invoke-Command -ComputerName (Get-Content Servers.txt) -ScriptBlock {Update-Help -SourcePath \\\\Server01\\Share\\Help -Credential $cred}