Apple’s latest macOS (version 10.15 Catalina) was released this week.
There are two issues relating to FlowJo we are aware of:

  1. On Catalina, dongles are not authenticating FlowJo v10 when launched from the application icon. We have found a short-term workaround:
  • Locate the FlowJo application
  • Right-click on the FlowJo application icon and choose “Show Package Contents” (If it’s on your dock, first right-click and select “Options/Show in Finder”)
  • Within the Contents folder, open the “MacOS” folder then double-click the application named “flowjoJavaApplicationStub”
    Note: You can create an alias on your desktop for even quicker access! 

This will allow you to run FlowJo v10 with your dongle. We will provide more information and a fix as soon as possible. 


  1. As communicated previously, FlowJo v9 will not run on macOS 10.15 Catalina. FlowJo v9 is a 32-bit application, and is not supported by Catalina. We remind FlowJo v9 users to maintain macOS 10.14 Mojave or earlier in order to retain access this legacy version.


If you want to use FlowJo on Catalina and have a license for FlowJo v9, that same license will work for FlowJo v10 using the above workaround for dongles. Visit our Downloads page to learn more and get FlowJo v10. If you would like a demo or need help, contact us at



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