Hrm, I'm not able to reproduce on UnityModules/master
(which should be identical to the package that's out there).
Opening it in Unity 2019.1.1f1, I see there's one upgrade error in AtlasBuilder at line 343 (an enum needs to be cast to an int). After that (and adding the UPM OpenVR package), there don't seem to be any problems with any of the VR Sample scenes (in Assets/LeapMotion/Core/Examples
).
Perhaps try cloning the aforementioned github repo, and try 2019.1.1f1?
Also, are you trying to use the HDRP? There is known bad behavior with the HDRP (as it changes the order of some of the rendering callbacks); disabling Temporal Warping is the right call in that case until support can be grafted in...