The latest versions of both NHHDA, EAC/AA and ELERT are available for download through the portal. If you are unable to see them, go to your profile page and check that you have the relevant privileges to download EAC/AA and/or NHHDA software.
If you do not have these privileges, you can request them, and when your request is granted by ELEXON the software will appear on this site when you log in.