Microsoft Windows 10 Enterprise LTSC 2019 Version 1809 – is the current LTSC option and was released in November 2018. The next LTSC release can be expected toward the end of 2021 customers currently using the LTSC for special-purpose devices should start working to upgrade those devices to Windows 10 Enterprise LTSC 2019 as mainstream support for that release will continue until January 9, 2024
