If you are in doubt as to the various game versions, take a look at this video for clarification:
Harpoon Classic and Harpoon3 Comparison
[video=youtube;LpXyEd6MxgU]http://www.youtube.com/watch?v=LpXyEd6MxgU[/video]
The Harpoon Ultimate Edition bundle from Matrix is the only commercial offer at this time. If you purchase it, the bundle includes:
1) HCE - Harpoon Commander's Edition
2) H3 (v3.6.3) - Harpoon 3
3) ANW - Advanced Naval Warfare (v3.9.4)
4) HUE - (v3.10)
HCE is the latest version of Harpoon Classic.
HUE is the latest version of Harpoon 3.