If you don’t know your Unity license information, speak to the Owner of your license. You have internet access, but you’re unable or unwilling to install the Unity Hub.You have internet access, but you use Unity in headless mode (without a GUI) for automated tasks, such as builds and tests.You might consider this method in situations such as: The following information covers an alternate method to Unity Hub for activating and returning a license for Unity Plus or Unity Pro, by using the command line. For information about activating a Unity Industry license, refer to the Unity Support article, How to activate or return a Unity Industry license. The primary license activation method for Unity Plus, Unity Pro, and Unity Personal is the Unity Hub. For a Unity Personal license, you don’t need a serial number. For Unity Plus and Unity Pro licenses, you need to get a serial number. To use Unity, you need an activated license.