How many devices are supported under one license? What does the Devices Remaining mean?

With one license/account, you can use the Immerse Gamepack FINAL FANTASY XIV edition app on up to 5 devices. In order to use your profile on other computers, you will have to download the Immerse Gamepack app and enter the license code, and it will automatically pull your profile to that computer. You can check the 'Number of devices remaining' on the Immerse Gamepack app.