Then don't say that it doesn't let you download. Click on the link and then "Save on Disk." Then open the file using Pepakura Designer or Pepakura Viewer (preferably the former).
Just to let you know, we're not too fond of members who claim that they did everything and then we find that they hardly did anything. Just be honest about things. We're more than happy to help people and nudge them in the right direction but not to the point of spoon-feeding them.