A Unity ID allows you to buy and/or subscribe to Unity products and services, shop in the Asset Store and participate in the Unity community.
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If it helps anyone with this in the future, I did the following to resolve the same problem: System: Installing 2019.3 via hub 2.2.2 on MacOS...
Certainly answered some questions that I have been seeking out for some time so thanks David. Its other (experienced) peoples case studies that I...