PM'ed to say:
Hi! You can contact me at grimes@corona-renderer.com to discuss further.
The best solution would be the Educational/Student license - while it isn't free, at 24.99 Euro for a year it costs no more than a textbook, and can be used commercially so could easily pay for itself.
The educational pricing is listed here:
https://corona-renderer.com/prices-licensing/And information about it is here:
https://corona-renderer.com/prices-licensing/student/The free Alpha 6 is of course provided "as is" since it would cost money (development time) to update it for Max 2017, and of course Corona has come a long, long way since the A6 version so it's not even really the same program any more - with the educational license, you and your students would be able to take advantage of Denoising, LightMix, greatly improved render times, PBR shading, VFB post processing like LUTs, bloom & glare etc, and much more.
Hope this helps!
Thanks!
Tom