I'm not at my computer so I can't say for sure, but newest version asked for a password when it started up and I don't remember the older one doing so. Did it ask when you attempted to write the image? Maybe there's a place for a password on the old one? Or maybe it requires to be started with administrator privileges?
If you have access to a Windows computer, it literally takes 2 minutes to do, so that might be the easiest way. If not when I get home I'll see if I can figure it out.