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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Update - I was mistaken about the file that it's trying to download, it wasn't UnitySetup-Facebook-Games-Support-for-Editor-5.6.1f1, it's...
Same problem here, collab server issue?
@NelepovDS @ap-unity I have the same problem, I follow the instructions to add a new IAP button to a scene, set it up with a product, everything...