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Hello Windows 10 Enterprise LTSC (Long-Term Servicing Channel) is a corporate product and requires a volume license. Each LTSC release is a separate version and has its own licensing. Therefore, a license for Windows 10 Enterprise LTSC 2019 would not be valid for Windows 10 Enterprise LTSC 2021. It’s also important to note that the LTSC 2021 release is not a direct replacement for LTSC 2019, as they have different lifecycles. LTSC 2021 has a 5-year lifecycle, while LTSC 2019 has a 10-year lifecycle. If you want to upgrade to Windows 10 Enterprise LTSC 2021, you would need to purchase a new license.
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