It looks like this is the same question as you posted before, did the answers you got there not help? or are you still having an issue?
If the client is NOT in your netork, you will have to put the Web Server on a Public IP or have them connect through a VPN.
There is no "Client Install" It is an active X that installs when the client connects to your Web Server EPDM.
There is an alternative to the Out of the Box Web Client, the alternative is a Web application that has all of the out of the Box functions, plus it provides access to the edrawings, and other viewers to view files.
Additionally, there is no required client installs except the free edrawings from SolidWorks.
If you are interested I can give you a quick demo.