64bit,i believe.when i load it the unity icon appears with a red box with a ! inside on the top left corner.
I have the same problem. Run the Tower.exe, get a small unity window with the red ! in the upper left corner and a red progress bar at the bottom, then it closes. Modest PC: 3.4GHz Phenom II X4 965, 16GB RAM, 2GB GTX 950, Windows 10. no log file or other error info I can find.