Cannot install Windows 10 Cumulative update KB3194496 for x64

the workaround could not be simpler:

1. delete folder C:\Windows\System32\Tasks\Microsoft\XblGameSave
2. delete registry key: HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\WindowsNT\CurrentVersion\Schedule\TaskCache\Tree\Microsoft\XblGameSave
3. Re-run the update

-> link to the solution