Create a regular installation. Create a user "DEMO" with password "DEMO". Then, on line 7 of wrx.cgi change $demo_mode=0; to $demo_mode=1;
All functions that could write changes to the server will instead pop up an alert "DISABLED FOR DEMO". There are 33 places where this happens so we built it in.
Then you need to use the autologin feature. Use a link