Ok - I finally got to the bottom of this - i.e. installing the new version 7.2.3.R2 for Mac under Crossover - all previous attempts simply re-installed the old version.

I downloaded the KVS setup utility from the main KVS screen into my "download folder" then in Crossover I selected the Install Application option, then selected KVS from the list of "Community Supported Applications" then I manually set the install utility to select the setup .exe from my download folder. Then hit the INSTALL button and it worked.

Now I have no idea if this is what you have been telling me to do but all other combinations simply re-installed the old version.

Also, once installed I did need to re-enter all my FF program details but this may have something to do with my convoluted installation procedure.