Overview: The Windows 10 May 2019 Version 1903 Update is currently available only to Windows Insiders and is currently not available for the general public. Windows 10 Insider Preview Build 18362.53 is only available to Windows Insiders. If your device is updated to Build 18356.30 only then it will be offered this build. The update also includes security updates.
You must be a Windows Insider on the Fast, Slow and Release Preview rings and be running Build 18362.30.
How to Update
To get this update, you must be a Windows Insider and should be currently running Insider Build 18362.30 for the update to be downloaded and installed automatically from Windows Update. You may also download and install the standalone package for this update from Microsoft Update Catalog .
Fix Error 0x800705b4
You may get error “0x800705b4” after installing this update while launching Windows Defender Application Guard or Windows Sandbox.
You can follow the workaround mentioned below:
Open regedit by typing regedit in the windows search box and navigate to HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows NT\CurrentVersion\Containers\CmService\Policy and set it as follows:
Microsoft is working on a fix and it will be taken care of in next release.
I hope this post provided you enough information in regards to Windows 10 1903 update and helped you to resolve Error 0x800705b4. This post will be updated once update 1903 is available for all.