You need to run the server before clicking on the link below.
In the start up folder, there is a program called "xcontents", versions for Linux, Windows, Mac, and Raspberry Pi.
Run that in a shell or command window as "./xcontents 8082", in the folder that the program is in (so first change directory to that folder).
On windows it is just "xcontents 8082" without the leading "./".
Once that is done: click on this link to check that it is running correctly.
Alas some Windows virus checkers think that xcontents.exe is malware (it isn't; feel free to grab the source, and compile it yourself).
As an alternative, there is a tiny Javascript server called server.js that will also do the job.
If you already have node installed, then in the folder
that the program is in you can run
node server.js
If you don't yet have node, go to https://nodejs.org/en/download/, click on "Windows Installer", run the installer, and follow the instructions.
Then start up the command prompt, and run
node server.js
Then click on the link to check that it is running.