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Hello
Upgrade windows LTSC need perform an in place upgrade using Windows Ent LTSC 2019 ISO.
Preparation:
Download the ISO file from VLSC for from license supplier
Volume Licensing Service Center (microsoft.com)
Note: For the sake of double security, it is recommended that you back up your important data first to prevent unknown issue during the upgrade.
Steps:
Perform an in-place upgrade of Windows Server | Microsoft Learn
Best regards,
Wesley Li