There are six different client links on that page.
Three 32-bit
Code:
http://64.34.161.181/download/3.5.0/Linux/nxclient-3.5.0-7.i386.rpm
http://64.34.161.181/download/3.5.0/Linux/nxclient_3.5.0-7_i386.deb
http://64.34.161.181/download/3.5.0/Linux/nxclient-3.5.0-7.i386.tar.gz
and three 64-bit
Code:
http://64.34.161.181/download/3.5.0/Linux/nxclient-3.5.0-7.x86_64.rpm
http://64.34.161.181/download/3.5.0/Linux/nxclient_3.5.0-7_amd64.deb
http://64.34.161.181/download/3.5.0/Linux/nxclient-3.5.0-7.x86_64.tar.gz
You just either navigate to the directory that you want to download the file to and:
Code:
wget http://64.34.161.181/download/3.5.0/Linux/nxclient-3.5.0-7.x86_64.tar.gz
Substituting the URL for the one that is appropriate for you
You could use Firefox to navigate through the links.
What problem did you have using Firefox to download the version of your liking?