I'm not aware of this option; I've viewed Apreso videos in IE, Firefox, Chrome, and Opera, all on a Windows box, and never had an option to increase playback speed. For my school, at least, streaming is the only option available.
If OP is in the same boat, there is always
Myspeed, which adds a playback speed option to any Flash video. It works pretty well, although if you watch it too quickly over a slower internet connection, you'll run out the buffer and have to wait while it's refreshed. Unfortunately, it's not free - to purchase a license costs $29.99. On the other hand, if it works for you and saves you some valuable time, it may just be worth it.