The MPC Software/Essentials license (same license terms I believe) states that you can only install the software on one computer at a time, multiple concurrent installations do not seem to be allowed. You can check the license by running the Essentials installer (just run it until the license shows) . For example:
1.1. Device license. You may install one copy of the software on one hardware device for your internal business use or your own personal enjoyment. The software may only be used by one person at time, unless you have purchased licenses for additional users......
10.1. Device transfer. If your license is limited to one hardware device, you may transfer your licensed copy of the software to a different device for your internal business use or your own personal enjoyment provided that you completely remove the software from the former device.
Akai used to have an FAQ that stated you were allowed 4 unique authorisations, but that FAQ is gone, and there is nothing in the license about any kind of authorisation limit, although I believe people have confirmed that this is the case (as people have reached it and required a reset). But any auth limit is separate to the above quote license terms - officially your are not allowed to install the software on multiple computers
simultaneously. So before installing on a second computer, you must uninstall from the first computer.
However I can't really see how that restriction can be practically enforced or monitored, especially if you only ever use the one computer at any one time.
I also believe that EU privacy law would require that Akai make it very clear if the software was 'calling home' to do anything other than check for any available software updates.