It can be found here: http://astronautz.com/MercTactics/MercTacticsSetup.exe
Instructions on how to play here: http://astronautz.com/MercTactics/help.html
The game should now work on practically any GPU. I relaxed the OpenGL requirement to 2.1 and tested that it works even on an ancient GeForce 7600 GS.
Also, there are a lot of bux fixes, tweeks, improvements and some new features.