The SIX Client can be installed on as many machines on your network that you desire.
The SIX Client must be installed on Windows, there is no Mac version of SIX. If using a Mac, you will need to install on Windows either in Bootcamp or Parallels.
You should install any third-party software you wish to use with SIX like Visio and/or AutoCAD prior to installing the SIX Client. If you plan to install these later, see here for information.
The SIX Installer will automatically add the needed exceptions to your Windows Firewall. If you are using another firewall on your machine/network, you will want to make sure that the following ports are added as exceptions:
Port 9010 - this is the default port that the SIX Client uses to connect to your SIX Server
Port 1433 TCP
Port 1434 UDP
The following web addresses are important and you will want to make sure these are allowed through your firewall:
cloud.d-tools.com
files.d-tools.com
downloads.d-tools.com
ws.spexlive.net
Click here for instructions.