As far as I know there never are zip files in a Maven repository. Did you find them for previous versions?
You can download the zip distribution from Sourceforge.
Yes, for the older versions they are there.
And that's quite usefull.
It was a mistake that older versions pushed ZIP files to the Maven repo. Maven repos should only deal with jar files (and srcs). I fixed that with CR6. If you want the ZIP files, grab them from Sourceforge.