A few weeks ago, Fujifilm acknowledged compatibility issues of various Fujifilm software with MacOS Catalina.
Today, there has been a further update:
February 13, 2020
Compatibility with macOS 10.15 is added. Download them from the website and install them.
With macOS10.15.2, some of functions might not work well because the connection between a camera and Mac can become unstable. So make sure to upgrade the macOS to macOS 10.15.3 or newer.