How does the JReviews license work
From JReviews Documentation
When you purchase JReviews you are issued a license key. The license key is necessary to access the JReviews App Store from within the JReviews admin dashboard. Within the JReviews App Store you'll be able to install Add-ons and perform updates quickly using the remote updates functionality.
App Store access is limited to one site for the Standard and Professional plans and five sites for the Developer plan.
To continue having access to the JReviews App Store to install Add-ons and perform updates, you'll need to make sure your support & updates subscription remains active.