Download the code from https://github.com/NakedPowerShell/SQLSatDL and put it in a local folder like C:\SQLSatDL
From within PowerShell type this:
Import-Module C:\SQLSatDL\SQLSatDL.psm1
# To see a few examples for this module run this
Get-Help Get-SQLSatDL -Examples
# Decide where you want to store the content downloaded like K:\SQLSat_DL
Get-SQLSatDL "K:\SQLSat_DL" 696 -Uz $true
Get-SQLSatDL "K:\SQLSat_DL" 696 -Uz $true -verbose
# To see all the comment based help
Get-Help Get-SQLSatDL -All