macOS 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 macOS 10.15.0/10.15.1. 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 more details, please refer to the respective camera's user manual.
We sincerely apologise for the inconvenience and appreciate your patience on this matter.
First posted on 12 Dec 2019