Is it possible to run a 3D-based course developed using Unity offline by providing it as a downloadable version?

What are they downloading? Is the intent that the students don't have to visit the Unity3D site to get a copy of Unity -- they get it from the course website? Me, I'd rather students get everything the "real" way. As a student, I always hated getting some course software and not knowing if it was a real thing I could use later. And Unity3D from here is an easy download.

For "lessons," distributing a scene as a package works great. And you can create, upload, download those anywhere, never having to interact with the Unity site. Then just "everyone download and install the hw3 package."