I'm wondering if there's a glitch with the Beginner's Guide tutorial page. I tried yesterday to do a walkthrough with my students on the use of Construct2 using the Beginner' Guide, and none of the images were present in the guide.
I had to use archive.org to go to a previous revision of the site that had the images, and use those instead.
By the way, after using it for about an hour, a few of them seem hooked on the possibilities Construct 2 offers.
The other engines they're learning are UDK and Unity.