Quote from BeckCould you not just rename the map on your server (e.g. de_dust2_vers2)? This way the game will recognise the players don't have that map in their game directory and will download it for them.
If rename, will make wrong with bsp file, example orginal name is de_toscan, rename to de_toscan1, map will need long time to creat new NAV file, and radar will lose