1) The the page you just linked is loading the current version. Search for ‘2.40.3’ in the source and you’ll see it:
However, the original, non-working page is still loading the old version – search for ‘2.38’ in the source and you’ll see it:
I don’t know why one page works and the other doesn’t. Perhaps a plugin is cacheing it or the server. You can try deactivating your other plugins for a moment and restarting the server.
2) The settings are available on the settings screen, so you don’t need to include them in your code unless they will be different for each map. If you need to include them in code the parameter names and allowed values are in the documentation: