I didn't think the test drive was any different from the trial version. I am not sure if they issue the books now that everything is available for download. The book only went through basic tutorials, I am sure the online tutorials are more comprehensive. I haven't seen a test drive kit since R10 but I am pretty sure it is basically the same.
What 'files' exactly are you looking for, the links above allow download of inventor 2012 30 day trial and the the first one has the download link for all the tutorial parts and assemblies.. are these not the same as the 'test drive' files on disc?
"Oompa Loompas of science" - Sheldon Cooper
I thought I was wrong once but I was mistaken