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Introducing the new Universal Render Pipeline and High Definition Render Pipeline subforums!
Unity 2019.3 Beta is out now.
It's available in preview mode for 2019.2 right now: https://forum.unity.com/threads/xr-plugins-and-subsystems.693463/
When they say the "Windows Store icon" they mean the blue square with a cross (It looks like the new Windows logo). That is the general icon that...
What version of Unity are you using?