Did you also download the Additional Content file?
It's possible you'll have limited access to a lot of this additional content, since this is an older version of the program and has limited support. For instance, effects and instantmovies that were formally on Photoshop.com (indicated with a blue banner over the upper right corner) are likely no longer available, since that site has been shut down.
Premiere Elements 10 Windows included the following Plus Members Only Instant Movie Themes (representing the photoshop.com plus membership)
Now they are all alive and well (except for maybe Spring Fever) in Premiere Elements 11 Windows as FREE for Instant Movie Themes.
So in newbe 510 case, I see too possibilities at the moment...
a. customize one of the Instant Movie Themes that came with Premiere Elements 10 Windows (we can go into a how to on that)
b. upgrade to Premiere Elements 11 Windows