I would be willing to wait for a physical copy plus a book.
For starters, I don't use Steam or MP. I have no problems with them, it just isn't what I do.
I like the idea of having software on a physical medium. It makes it simple in case I run into hardware issues, I upgrade parts, or buy an all new system. Its one less thing to find online.
A book would be a great idea.
I would rather learn about in-game procedures and tactics at my leisure rather than just before calling "Weapons free!".