Having 3 computer Installation Package, What happens if I change computer?

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I am thinking to upgrade to a 3 computer package from Avast, but One of the computers I am thinking to install now may be sold later, or not in use anymore, during this period, what happens if I get a new computer and want to use a fully registered/paid for copy on that new computer? The telephone support wasn't able to give me a Clarification on this, So I hope someone clearly indicates the process in the case of changing computers during paid period?
Thanks

[DavidR]

Uninstall avast from the system you are going to sell, go to my.avast.com and remove the device that you have just uninstalled.

Ensure that you have saved your avast license (license.avastlic), install avast on your new computer and apply the license to it.

Or use the Resend avast License https://www.avast.com/resend-license-paid.php, you will need to enter the email that you used when purchasing the license, e.g. the one that the original email with the link was sent.

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Thank you for the detailed answer

[DavidR]

You're welcome.