Windows 10 April 2018 Update error 0xc1900101: The Windows 10 April 2018 Update update has been available for a few days. If you have not been notified to update your system, patience will appear at some point. Of course for the hasty we have published a tweak instant installation manually.
The following publication concerns installations that show bugs, and specifically the error code 0xc1900101. We'll see in detail what you can do if your system update crashes and you get the code above.
To fix 0xc1900101 error, you will need to edit your Windows registry and this will require administrative rights. We always recommend that you back up your Windows registry before trying the following.
Fix 0xc1900101 Error
Before we begin you will need to remove any additional languages that you have added to Windows 10. You should have only one language on your system. There is no limit to which language it will be, but there must be only one. You can remove languages from the Settings application.
Open the application and follow the path Time & Language - Area & Language and select the language you want to remove. Repeat for all additional languages you have installed.
Immediately afterwards open the Windows Registry by typing 'regedit' in Windows Search. Alternatively you can open the RUN by pressing the two Win + R keys together. When opened, type 'regedit' without the quotes and press enter to open the processor.
Follow the route:
HKEY_LOCAL_MACHINE \ SOFTWARE \ Microsoft \ Provisioning
Delete it under Provisioning. If after that you try to install the update again, it will proceed with no problem. The keys you have deleted will be automatically added to the registry as soon as the update is complete.
If you do not want to delete the keys, there is an alternative. Find a different system running Windows 10. In this system, from the same path, copy it there, save it somewhere, and replace the files in your system where you see the 0xc1900101 error.
That was, run the update again and this time it will install without problems.