Hi all, thought I'd share my experience with you. Back in March I posted saying I had troubles with installation, and after much debate resigned myself to not being able to update.
I reinstalled ANRB into it's own file, not in Program Files.
Seeing the latest database, I tried installing it in C:\AirNavSystems\Radarbox and left off the Data at the end. It has now, miracle of miracles, updated my database.
For those experiencing problems with updating, try these tips, you never know it might work.