Now sorted! It was to do with the way I was downloading the files from Dropbox, I think. I saw the Rave folder and thought that was it - when I just downloaded the entire contents, it came up with a different folder name and all the extra files, including the vital Rave.exe. Many thanks to all who have patiently held my hand, especially Wazzajnr for the files and Saint.V8 for the excellent video, which was pretty much at my level. What a great site this is.
Cheers, all.