Failed to install Windows 10 Update, Windows error 0xca00a000 is displayed when Windows does not have one of the cumulative updates installed or when there is a problem with the driver that prevents Windows Update from progressing . Many times, when system files are changed with incorrect permission, this can happen. You will need to correct the permissions of the approved installer and resolve the driver problem. Follow these tips to resolve this installation error.
1] Run Windows Module Installer
The Windows Module Installer is a built-in Windows OS service. You have to make sure that it is Started and its Startup type is set to Automatic. You may do it via the Services Manager or by executing the following command in an elevated CMD–
SC config trustedinstaller start=auto
Once successfully executed, you should see [SC] ChangeServiceConfig SUCCESS displayed within the Command Prompt console.
See if this helps.
2] Install updates manually
3] Your Windows operating system may have missed the installation of a particular update and may not succeed. You can manually install the update by downloading it from the Microsoft Update Catalog Web site. Also, make sure that you have not disabled Windows Update or delayed it.
3] Delete Files from Software Distribution Folder
You can clear the contents of the SoftwareDistribution folder, and let it start from fresh. Files are downloaded in a dedicated folder C:\Windows\SoftwareDistribution. Delete all the files in it after pausing Windows Update Service. Second, try restarting the computer multiple times to see if the update process automatically starts.
4] Hide the Update
You may choose to hide this Update if you wish and prevent it from installing.
5] Run Windows Update Troubleshooter
Run this inbuilt Windows Update troubleshooter to fix most common Update problems on Windows 10.
6] Run Microsoft’s online troubleshooter
You can also fix Windows Update Errors using Microsoft’s online troubleshooter. It will scan your PC for issues, and fix the problems.