Fujifilm announced 2 weeks ago that some of their software had issues with OSX 10.15 Catalina. Today they issued an update for some software that is now compatible.
＜Updated history＞
Nov 14, 2019
Compatibility with macOS 10.15 (Catalina) is added to the application software below. Download them from the website and install them.
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via Fujifilm