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You can easily instantiate a child class at runtime. You can launch your application with only the parent class in memory until you specify which child class should be instantiated. Each of your child classes can be placed in their own libraries (LLB or packed project library 'should' work). The path to the class in the library can be passed to the 'Get LV Class Default Value' function as shown in attached. However, without looking into it more, I'm not sure this really solves your problem since you are trying to load code that is specific to a LabVIEW version. It sounds like you want to create a parent class that can be opened with either LV2013 or LV2015 and then dynamically load a child class that could have been created with either LV2013 or LV2015. Is that correct? -Eric

I have recently resurrected these articles under https://blog.kalbermatter.nl

Does this work: http://www.ni.com/example/30051/en/ It says it works on all LabVIEW versions post-2011, but I've not tried it.