How to migrate Plesk license key from old server to new server with CentOS

If you are having problem with plesk license key to move from old linux server to new linux server, it is simple task.
Just download and install new server with trial key. After Plesk is up and running in new server, copy the key file from old server to new server.

key file location:
/etc/sw/keys/keys

There is key license xml files under the above directory.
Make sure to shut down the old server after you activate the new server.