On some systems, the error 0XC19001E1 may occur when installing a Windows 10 feature update — e.g., when upgrading from version 1903 to 2004, 2004 to 20H1, etc. The 0XC19001e1 error is one of the vaguest error messages of all the Windows Update errors.

Feature update to Windows 10, version 1903 - 0xc19001e1
The Microsoft-Windows-WindowsUpdateClient event log channel may have the following entry logged:
Log Name: System Source: Microsoft-Windows-WindowsUpdateClient Date: Event ID: 20 Task: Windows Update Agent Level: Error Opcode: Installation Keyword: Installation, Failure User: S-1-5-18 User Name: NT AUTHORITY\SYSTEM Computer: Server Description: Installation Failure: Windows failed to install the following update with error 0xC19001E1: Feature update to Windows 10, version 1903.
If you run setup using the Windows 10 Update Assistant or the Media Creation Tool, you may see the following error message:

This PC can't be upgraded to Windows 10. Your PC has hardware that isn't ready for this version of Windows 10. No action is needed. Windows Update will offer this version of Windows 10 automatically once the issue has been resolved.
Let’s see how to fix the error 0XC19001E1 when updating Windows 10.
