The only way to get the full Content for Premiere Elements 11 and 12 is from within the programs.
The process can be slow depending on the Internet connection and the Adobe server.
I wrote about this for version 11 in a blog post.
Although there are some here who may say that what you are experiencing is unusual. I have always found obtaining Premiere Elements 11 and 12 Content to be slow and labored.
Right now, have patience, download one at a time, try again at different times.
Please let us know the outcome.