The download is straightforward but laborious, 40 odd files one at a time. Other software needed, 7 Zip and VirtualBox are included in the download list. After purchase you get an email with the link to the files, receipt and full instructions (I got 4 copies of this). Read the imstructions carefully about 3 times. I downloaded all the files to my browsers download directory and then moved all 42 relevant files to a seperate directory before firing up the extract process, its probably not necessary but I like to keep things discrete if possible.
The downloads took about 4 hours, extract about 35-40 mins, rest of install about 10 mins.
Its worth it, comprehensive info on literally millions of cars for less than a tenner.