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Create an X-Aviation account (if you do not already have one)
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Go to www.x-aviation.com/serial_redemption/ and enter your M20 serial number from either the AFM Store (FastSpring) or Threshold Store. If you do not know your serial number, you can find it in your original order email. If you don’t have your original order email, create a support ticket and we can help you find it.
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Enter the email address associated with your X-Aviation account.
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Download the installer for the M20 Collection. For instructions on installing X-Aviation processes, see the article here How to install an X-Aviation Product
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Run the installer. Note: the installer will remove the previous version of the M20 by removing the X-Plane 11/Aircraft/AFM folder. If you have any custom liveries or other modifications you wish to preserve, back those up to a separate location before running the installer.
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Enjoy! If you have X-Aviation products already, the plane should automatically activate. If you do not, simply sign in to your X-Aviation account using the prompts in-sim.