Each copy of Keyclone is good on piece of hardware (at a time).
The license is transferable, as often as you'd like.
It is also good forever, it will never expire.

You need access to the email you used when you bought it.
Basically hit transfer license.
Log into the email.
Click the link and transfer the software to the new system.

You can transfer back and forth, between desktop and laptop, as often as you wish.

If you ever decide to use both at once, you'll need another copy of KC.