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I think that I need Processing 2.2.1 to use the SimpleOpenNI library and therefore need 2.2.1 I have retained an old version of 2.2.1 and downloaded the currently available version. When both these versions are started, they both start 3.2.3.
Answers
I got round this by navigating to the .pde I wanted and using Open With Processing 2.2.1
Thanks, I had kept my Processing and Processing 3 files separate and don't need to run both at the same time.