Thanks so much, James! I've found the password file and this is a big plus, as now I can save it, albeit manually. I might search for the file name, so I probably find out how or where it is written - my hope is still to find a way to have it written directly onto the e: drive.
The trick with the user agent doesn't really work for me. In the older 1.5.4 I've changed the agent in 'Preferences'