Install-Module : The term ‘Install-Module’ is not recognized as the name of a cmdlet, function, script file,
or operable program. Check the spelling of the name, or if a path was included, verify that the path is corre
ct and try again.

Install Either of these : 

$x86 = ‘https://download.microsoft.com/download/4/1/A/41A369FA-AA36-4EE9-845B-20BCC1691FC5/PackageManagement_x86.msi’
$x64 = ‘https://download.microsoft.com/download/4/1/A/41A369FA-AA36-4EE9-845B-20BCC1691FC5/PackageManagement_x64.msi’