Currently we have 2.x.y-preview.z and 3.x.y-pre.z preview package versions of the Oculus XR Plugin available via Package Manager if you have preview packages enabled. These 2.x and 3.x versions are currently primarily available for folks who want to use the Oculus Application Space Warp (https://developer.oculus.com/documentation/unity/unity-asw/) feature. The 2.x.y packages should be used with Unity 2020.3, and the 3.x.y packages should be used with Unity 2021.2+. There was recently an issue with some of the package manager metadata that was causing the 3.0.0-pre.2 package to show up in the Unity package manager in 2020.3. This was incorrect. We've resolved this issue on the server side, but the incorrect metadata may still be stored locally on some machines. If you see a 3.0.0-pre.2 version of the Oculus XR Plugin in 2020.3, just use one of the more recent 2.0.0 versions, currently 2.0.0-preview.4 at the time of this post. If you aren't using ASW, you can continue using the verified package versions and ignore the preview packages. One important note: the 2.x.y and 3.x.y packages now use the OpenXR runtime. This has implications for things like hand tracking, as well as preventing using gamma color space with GLES.