You need to upgrade Update Assistant to download and install Windows 10 November 2019 Update
The Windows 10 November 2019 Update (v1909) was officially released on November 12. This Windows 10 version 1909 did not introduce too many new features, it focused on feature improvements and bug fixes. Today Microsoft updated the Update Assistant Tool to allow users to download and install Windows 10 November 2019 Updates.
The Update Assistant Tool is available for any version of Windows and can be streamlined to the latest feature updates after download and installation. In addition to the traditional Windows Update update and the Update Assistant Tool, users can also use the Media Creation Tool to install Windows 10 version 1909.