For reference the link to programmers multiclient is
As for if it is not working for you, myself sometimes I would get that problem when trying to open +4 windows
To fix: exit
all instances of conquer, replace the Conquer.exe file in the correct directory ( probally C:/program files/conquer 2.0 )
hit ok when asked to replace, restart computer and it should work.
Randomly sometimes it would die on me as well, but usually a good restart will fix any problems!