I have the Windows version of Spaceward Ho! 2.0, but it crashes a few turns in when running on Windows XP. It is the full version, but since it was written back for Windows 95 (maybe even win 3.1) - this version - it doesn't like XP.
Anway, you can buy v5, but I agree the price is a bit steep for it compared to other available games. However, I also agree that it is a really good explore the galaxy game.