Looks like WMR seems to stop this Windows 10 update from being installed. It contains a bunch of security updates, so worth checking if yours installed ok.
To get around the WMR issue (again, this happened before):
A copy here in-case it gets edited:
In short you don’t necessarily need to uninstall WMR entirely:
- Disconnect HMD (you can unplug the power on the breakout box of the HP Reverb G2)
- Open administrative command prompt (right-click and run as administrator or type “cmd.exe” in your start menu and press ctrl+shift+enter)
- Run “dism /online /remove-capability /capabilityname:Analog.Holographic.Desktop~~~~0.0.1.0”
- Re-Run windows update, reboot and re-connect your HMD
This procedure does not require you to set up WMR from scratch after the procedure and saves you some time.