Install the license
After your registration you will find a free trial license in your dashboard. Copy the license number.
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Inside the plugin dashboard press the button on the top-left corner with the logo. Will show you a new sidebar menu. Select the License menu.
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Will open a popup. Paste the license number and press activate. The license will be attached to your domain, but you can deactivate the license and activate in another WordPress installation.
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In your account in alexreservations.com you can also view the domains that you have activated for each license and even disable it from there.
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You can manage different licenses for different WordPress sites. And inside each WordPress you can manage one or several restaurants depending on your plan.