Problem of Deactivate key

I used isGnuin to activate product, I Revoked the key from LimeLm Server and I Licensing with a new key but always the product activate with the old key

If you use the Deactivate() function you'll notice it has an optional parameter (called, "deletePkey") that will deactivate and remove the product key from the computer.

Or you can just use CheckAndSavePKey to use a new product key (it only works if the customer isn't already activated with another key).