Microsoft have updated the SteamVR beta addin for Windows Mixed Reality. 1.2.44 fixes crashed with older versions of Windows 10 (prior to 2004). It also improves the input profile of the new HP motion controllers.
Windows Mixed Reality for SteamVR Beta has been updated to build 1.2.444. This build contains the following changes:
Fixed a crash introduced in the previous beta that can occur on versions of Windows prior to Windows 10 2004.
Additional input profile improvements for HP Motion Controllers.