I decided to try an upgrade to v3.01 beta this morning, I use Vista so my installation is in C\:Airnav.
The update offered the start menu folder name (default), I wasn't sure if this was a coded way of saying the default folder name so I left it alone to see what happened.
The result isn't pretty. What I have ended up with is the old start menu entry, a new one called (default) that contains the translated manuals and help entries , and the actual program files are in two places.
The old v2.01 folder tree is still in C:\Airnav, the new v3.01 beta is in C:\Program Files\Airnav and there is no shortcut to allow the v3.01 version to be run.
This wasn't at all what I was expecting to see. I'm going to rip everything out and start from scratch, I had save copies of my databases so I'll copy them back over the new ones that v3.01 installs I suppose.
I think the upgrade installer needs some work! ;-)