They keep making this more and more difficult. Used to be you could just choose between yes and no. Then they made it so you can only choose between yes and no if you don't have an ethernet cable connected. Now you have to use a hidden key combination and type in a secret command.
Soon you'll only be able to install without an internet connection by downloading a special ISO with a hidden download link. Soon after that they'll restrict said ISO to some insider program.
Failing to mention that JAR is just a ZIP file with special contents and calling tar a compression format sure is a bit incompetent for a textbook.