I really want to learn Unity and maybe I am one of the more rare individuals that learns faster from textbooks. I started reading the documentation online, but it was too slow for me... reading a bit here, then scroll down, read a bit more, then click next. It felt like I was reading at 60% my normal speed. I couldn't find PDF documentation anywhere and it looked like a few other people were looking for it too, so I whipped up a quick C# app to download the manual and then convert it into PDF... it's current as of November 28th, 2016 and is version 5.4. As long as someone doesn't make any crazy changes to how the Manual is structured online, I can run my app and get an updated PDF version at anytime.