I don't have access to my mac right now to check, but looks like nxmc-1.1.10.tar.gz is packaged incorrectly.
You can try do following:
* open Terminal.app
* cd to directory, where you unpacked nxmc (you can type "cd " and then drag folder from Finder to Terminal.app)
* run "chmod +x nxmc.app/Contents/MacOS/nxmc"
Invalid server version message means that we did some incompatible changes in communication protocol, for example you can't connect with management console from 1.1x.x branch to 1.0.x server.
You can try do following:
* open Terminal.app
* cd to directory, where you unpacked nxmc (you can type "cd " and then drag folder from Finder to Terminal.app)
* run "chmod +x nxmc.app/Contents/MacOS/nxmc"
Invalid server version message means that we did some incompatible changes in communication protocol, for example you can't connect with management console from 1.1x.x branch to 1.0.x server.