Moving this discussion to the Premiere Elements forum.
Please check out my blog post with all the details on Premiere Elements 11 Content.
Essentially, the rest of the Content for the program is obtained as a download from within the project from Adobe.
Note the blue ban at the top of the thumbnail for Movie Themes, Movie Menus, Title Templates. You right click that and then decide if you want to download just that one theme represented by the thumbnail or all the themes for the section that you are in, namely Movie Themes, Movie Menus, Title Templates.
Please let us know if you have any further questions on this matter.
The whole download is a big and time consuming one(clip arts + movie themes + titles + DVD templates) and I have had situations where it was accidentaly deleted(I dont know how, may be uninstall or something)
I would also suggest that you keep a copy of the download folder from the location C:\ProgramData\Adobe\Premiere Elements\11.0\Online, so that if it accidentaly gets deleted or Pre removes it while uninstall, you can just copy/paste.
Normally, it would work unless the Manifest file on server changes from what is in this local folder(which is rarely the case)
The complete details of dealing with the Premiere Elements 11 new Content download business is detailed in my blog post
that I cited in post #2 of this thread.