Microsoft reminds customers that some editions of Windows 10, version 1809, will reach its end of service next week. Microsoft urges customers to upgrade as soon as possible to keep systems bug-free and secure from attacks. Windows 10 20H2 (aka the October 2020 Update) started rolling out on October 20 to all users who manually check for updates via Windows Update (seekers) on devices running Windows 10 1903 or later. Microsoft has already applied update blocks to prevent devices with Conexant and Synaptics or ConeXant ISST audio drivers from updating to the latest version due to compatibility issues.
Source: https://www.bleepingcomputer.com/news/microsoft/microsoft-windows-10-1809-reaches-end-of-service-next-week/