I never liked the idea of downloading magic,
Especially DVD's like the system.
Things like that take some time to learn and get better.
I don't know how downloads work, but if your computer goes on the fritz and erases everything you have, do you get that download back? How many times are you able to watch it?
If you get a virus, then your computer will run slow as molasses.
I think to really understand the teachings, you need a hard copy of it, so you won't lose it and you'll always be able to go back to it a couple years from now or whenever.