Thanks to everyone who offered advice, especially Nightfly.
The truth is, I did not want Zip files in the first place, I only use a Zip file if it contains the whole album! I was using FDM.
I went back to my download section and rechecked the 12 x tracks, I checked before I downloaded and hey presto they were now mp3 files???
Listening as we speak and all seems ok now.
