Hi DebR,
Drivers are available for your Xerox C60/70 with EX-i Fiery controller. They can be downloaded at efi.com. Direct links are provided below be sure to use the link that matches the version of system software that is currently on your Fiery. You can check that either by browsing to the Fiery IP in a browser or opening device center in Command Workstation.
Links
Note: There is no Catalina driver posted for 2.0 Fiery system software. Going from 2.0 to 2.1 is delivered via normal Fiery updates (patches) and therefore there was no need to post a newer 2.0 driver. If you are at 2.0 use the 2.1 driver and consider installing the available Fiery updates to get to 2.1, if you encounter any abnormalities.
We are on Catalina and we are in our peak production season. I can't print our books and can't seem to find a driver that works for my printer.