Just read it on the conquer official forums. So i'll post it here before they delete it. I'm not taking any credit for this.
You need to have the Conquer 2.0 client, delete the server file, then take the 1.0 server file and put it in the 2.0 file. Log in to 2.0 and choose the server.
I'm playing it right now and i sometimes get errors but just ignore them and keep playing.
EDIT: ok to fix the error just copy and syndicate.tga from conquer 1.0/data/pic/sundicate.tga to conquer 2.0/data/pic and just relog into co 2.0 and that should fix it