As of september 1st 2013 Ham Radio Deluxe will remove the Free 5.x versions of the software: The following statement was posted on there site
All 5.x Files will be removed from the server on September 1, 2013.
You may host these files on your server or have them on a CD, but you may NOT charge for the CD or the access to your server.
With that in mind the last two 5.x versions can obtained from my site along with the FIX file which was needed to reset some of the read-only files allowing the program to function correctly:
HRD Version 5.24.38 - October, 2012 Release - (British / English Fix) HRD 5.24.38
READ-ONLY Fix Read Only Fix
Last 5.x Manual User Manual