I'm new to Unity and started setting up a basic AR project using this tutorial. However, my computer was too old to run the required version of Xcode needed. I've now migrated to a new Mac that can run the necessary version of Xcode but the Unity set-up that I automatically migrated from my old computer's backup isn't working right. It appears to be missing a necessary "license." However, when I log into my unity account there is no license listed. Unity doesn't seem to want to let me open any of my projects until I give it the necessary license. How do I proceed?