Sierra, macOS 10.12, is now available as a free upgrade. This new version of the Mac OS supports Java 7 and higher. This update removes Java 6, which is required by FlowJo versions 10.2 and older. We are working on a new version of FlowJo that will use the current version of Java.
If you are a FlowJo user we recommend that you hang tight until we release FlowJo 10.3.