Will Windows LTSC be upgraded from 1089 to 21H2 via Windows Update?

Question

Windows

Will Windows LTSC be upgraded from 1089 to 21H2 via Windows Update? Or do you need to reinstall?

Answer 1

In theory, this is possible, but in any case, I advise you to make a backup of the system before doing this, since something can always go wrong during such an update. And if there is a backup, you can always deploy everything back.

Answer 2

So 21H2 won't be there as it will be win11. We'll find out more in 20 minutes.
And in short - LTSC versions are updated only within LTSC. If win11, released in the fall, will have an LTSC edition and M$ will make it possible to upgrade like that, then yes - you can do it. If not, reinstall. But I think that since LTSC builds are the most stable and longest supported versions of the OS, then most likely LTSC will be released in 22 and M$ will make it possible to update to this version.

Answer 3

No. LTSB\LTSC editions do not include an upgrade to a major release. Only security patches.

Answer 4

Windows 10 21H2 LTSC will be. You can update as follows: download the ISO file, unpack it to a local folder, run setup.exe. In this case, it will be possible to save existing files and software. Some software (less than 10%) may stop working or work incorrectly.
I have successfully done this when moving from 1607 LTCB to 1809 LTSC.