FlowJo 9.7.1 addresses the issues previously described in the post below.
FlowJo V 7 / V10 also works via java 6, available here
FlowJo v8 and v9 are MacOSX only programs.
Currently, any FlowJo v9.4.x to v9.7 will not work on OSX 10.9, the programmer is working on an update, and says it may take about a week.
If needed, one can download flowjo version FlowJo v9.3.3
You will need an offline SN, or Dongle. FLS Serial numbers will not work.
Also, if you have .jo workspace files that were created with FlowJo v9.4.x to v9.7, you will need to save them as XML from the later version to allow it to be opened in FlowJo v9.3.3