If you are having trouble downloading files from the GHDx, we suggest that you:
Right-click on the title of the file instead of left-clicking. Next select Save Link As. Sometimes this method will enable you to download something when left-clicking will not work.
Use DownThemAll. This is a plug-in for the Firefox browser, which often works to download files when other methods do not work.
If DownThemAll doesn't work for the browser you use, look at the comparison of download managers in Wikipedia, which outlines similar tools and their features.
If you are still having trouble, please let us know. We would be happy to make arrangements to deliver the data to you.