When you are preparing an AD and extending schema while installing Exchange Server 2016, you may get the following error. If this is so, try the following solution.
setup.exe: The 'term' is not recognized as the name of cmdlet, function, script file or operable program. Check the spelling off of the name, or if a path was included, verify that the path is correct and try again.
Try executing .\setup instead of setup.exe