You do not need a paid subscription to get a basic registration key. Follow these steps to obtain one from the official source: Register an Account GLPI Network Services and create a free account. Select the "Registered" Offer
Teclib' occasionally offers basic marketplace registration accounts that allow community users to sync their local marketplace with the official plugin directory. Registering a free account on their official website can provide a basic public key to clear the warning. Method 2: Disable the Notification via Settings glpi registration key free