How to implement a self-destruct feature into free trial software?

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theGreenCabbage asks:

I am interested in implementing a free trial version to my existing software. I plan on having the trial last 14 days. Upon the 14th day, my software would prompt the user to either pay for the paid version, or have the consequence of not being able to use it. The free trial version is entirely unlocked, meaning all paid features are there.

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