After expiring my trial license, I have purchased a license. I try to enable Immerse Spatial Sound but it keeps saying "license expired". What shall I do?

After your purchase, you will receive a license code with your order confirmation email. Please go to your 'My Account' and click on 'Upgrade'. Please enter the license code: 

After clicking on upgrade, please close and open the Immerse Gamepack FINAL FANTASY XIV Edition application and start them again. Also, please close and open the game configuration settings to sync up with your upgraded profile.