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You can have multiple versions of CVI installed on the same computer. Can you explain in detail what you mean when you say that you cannot access CVI 2009? Do you mean that you can't open it or can't activate it?
I am not sure I understand what you mean by compiling CVI 2012 to work with TestStand 4.2.1. You should be able to create a DLL from CVI 2012 and call this code module from TestStand. Are you receiving any errors when you try to do this?
Regards,
Anjelica W. National Instruments Product Marketing Manager FlexLogger and TestStand