There are TWO links for missing Content... PPro & Encore basic and Encore extra
Encore additional http://helpx.adobe.com/encore/using/download-library-content.html
Did you do both downloads and installs?
Based on his other post (where he is responding to John's second link), I believe the second download is not being extracted to the library location.
Thank you, I was able to get help from a wonderful Adobe customer service man who walked me through the process.
Thank you again