Where are you downloading version 10 from?
Here's where you download version 12's trial. Make sure you log in with your Adobe ID.
If the link on Adobe's page won't work for you, go to http://forums.adobe.com/thread/1275830 and scroll down to the bottom for links to several versions of Premiere Elements
Encore is bundled with Premiere Pro, and due to licensing issues does not work until you pay for and register Premiere Pro