By skyforbes 
Windows 10 security Updates failed to install? Windows 10 Update failed with error like Microsoft cannot install important security updates on your PC error code: 0x80072ee7 0x8007001f, or 0x80070652. And sometimes the error would be like windows 10 security update won’t install 80240020. Here some applicable solutions to fix this.
First, make sure you have a stable internet connection To download windows updates from Microsoft server. Also, Run Third-party system optimizer like Ccleaner to Cleanup Disk space by removing temp, system error, memory dump files, And fix broken registry error. Run System File Checker utility to make sure any corrupted system files not causing the issue.
Also check Date and Time are correct on your system Because of sometimes incorrect Time zone cause update installation fails. You can check and correct date and time on your system from settings -> Time & Language -> date & time.
Run windows update Troubleshooter
Whenever you face any windows update related problems, We first recommend to Run the official windows update troubleshooter and let windows to check and fix the problem itself.
To run windows update Troubleshooter open Windows Settings -> Go to Update & Security > Troubleshoot. Then select windows update and Run The Troubleshooter.
Performa Clean Boot
Also, Try to perform Clean Boot And Check for updates. If any third party service or startup application cause issue to install the updates then perform Clean boot And Try To check for updates. This is also A most applicable solution to fix Microsoft can’t install important security updates on your pc.
Continue Reading: https://windows101tricks.com/microsoft-cannot-install-important-security-updates/