That was my first thoughts too.
My daughter is a teacher and I taught music lessons for 12 years so teaching is a skill I understand.
It's called "Preparing a lesson"
You owe it to your students to work in exactly the same environment they will experience.
It's reminds me of the computer course that was offered here and the teacher was still using Windows XP even though W7 had been out for a few years. His reasoning was ,,well the basics are all the same.
You will be best to install CbB to a fresh computer otherwise you won't have a feel for what is included. And besides, why are you reluctent to advance your software. There are big improvments made since x3.
Otherwise it's a good thing your doing so for that I commend you.