Information available here:
https://developer.pico-interactive.com/sdk
Instructions
Download SDK
Extract XR Plugin folder (e.g. UnityXR_v2.0.3_B51)
Install via Package Manager:
Windows > Package Manager > + > Add package from disk…
Select package.json. Unity will install the Pico Unity XR Plugin:
Set PixoXR as Android target in XR Plug-in Management:
Pico Neo 3 works with either XR Toolkit Player or XR Toolkit Player - Device Based.