Mac OS 10.15.2 was released by Apple on December 11, 2019.
Following operation checks performed with this version at Canon, we have confirmed a USB connection issue with “EOS Utility 3.11.1 for Mac OS X” and “Picture Style File Registration Tool 1.0.0 for Mac OS X“ whereby the functions enabled by connecting a camera and a Mac device via USB cannot be used.
This issue does not occur on macOS10.15.0/10.15.1. We are currently preparing to release versions of these applications that incorporate a fix for this issue. For EOS cameras with Wi-Fi functionality, the camera can be remotely operated from EOS Utility via a Wi-Fi connection with the Mac computer. For details, please see the user manual.
We sincerely apologize for the inconvenience and kindly ask for your patience.