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}