Hi guys! I dont know if this is the right sub-forum but I'll give it a try

I am really considering to buy the apache tutorial via the instant checkout option, This one
But im not sure if i should, because of a few things;

Could someone explain me please how this "instant checkout" works?
Do i get a link where all videos can be found?
Do i have to download it all at once?
(just give me an overview of how this works please i didnt find it in the faq)

In the first paragraph it says something about reference images :
will they be included?

Is there maybe a sample clip because 4 GB Video material and 26 hours of playtime sounds fairly poor to me (video quality)

Thank you for any anwers