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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I read this too. It is a shame they are so shady about communicating their error. Practically had to force it out of them. All so their sales...
The developer has broken the Pro version of this asset with release 2.5.2 (current as of writing). It no longer is configurable as they have...