How to track Adwords user and pass a variable into the downloaded software?

What I want is to calculate the ROI of a campaign and this is my scenario. A user comes from Google Adwords into my webpage and then downloads a software. The software is coded in C#. I know that there is a conversion option from Google that registers the action when the download button is clicked. But this is not the end because the ROI is not calculated when the software is downloade, but from his spending inside the software.



However, my question is more technical than that. What I want...



How to track Adwords user and pass a variable into the downloaded software?



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