Your class library can set a value in the windows register to state when it was first used....it would check this value every time it's used to see if 2 months has passed.
You could hard code it into your application so that the start date is when you ship the class library...check this date every time it's used to see if 2 months has passed.
...I'm sure there are other ways to do this but nothing is coming to mind right now
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