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Oh how I miss the days of paper clipping that 92 Lumina I had and counting the number of flashes of the CEL to diagnose a problem!!!
I had quite a time with it too.
You will need to go into,what I think is the definition files, for Your vehicle and get those files onto Your desktop, then import them from the desk top to TunerPro and then it will work.
I have it loaded in for My 88 Buick but I do not understand all of what it is suppose to do, then, I am afraid to change anything for fear of screwing up what is already a good running automobile.