First, a quick “thank you” to the 57 people who took the time to vote on this suggestion on the MSDN Product Feedback site as well as everyone else who suggested this on blogs, Channel9, and elsewhere, but the Express products are now available for manual download.
To install manually, go to whichever Express product you are interested in, then select the Having trouble downloading? Click here for manual installation instructions. link. After signing in, you will see a page with instructions for how to manually each of the pieces that the automated Express installer uses as shown in the screen capture below: