Hi Steve,
Not a silly question at all. Since several computer these days have no drive “natively” anymore.
(http://www.maxon.net/products/general-information/general-information/system-requirements.html)
The question with the demo r13 is easy to answer, it is not online (anymore) at least to my knowledge.
My suggestion: get in contact with the support and check with them, if they have an option or link for for.
http://www.maxon.net/support/support-questions.html
I guess you thought already about an USB DVD drive, but decided against it? I saw external drives for $20 already.
All the best
Sassi