Buy it from Dennis at ITP Diesel, he'll make sure it's right if anything were to ever happen with it. He's helped me more than once with computer crashes that required new activation codes for the older versions.
It's a great diagnostic tool, I use it at work all the time helping friends & customers with their vehicles. It takes a few hours to get used to the program and undertand some of the screens & setups - got mine from ITP Diesel also.
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