Are those version the same by campaings and maps and all games stuffs?
I have win7 64bit.
There are some new maps in 2.4-dev, also got +city disabled, there are new features like: production requirements, base buildings should connect each other, base defending soldiers can be selected, new reaction fire system, improved auto-mission and so on. Also it is more stable. (It's near to be released) But still the main campaign is about the same. You should be aware that savegames are not compatible between minor versions. I suggest downloading the 2.4-dev.
-geever