Some time ago updated my 3x w10 LTSC's, not a hitch, flawless as always.
The Dell 5540 now well into it's 6th LTSC year, original 10 install still perfect.
& the Thinkpad P14S loves it's iot 2021.
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To get some acquaintance with w11 (how to tame it!), using it on one of my Thinkpads. The latest 11 update plainly refused to properly download \ install, just stalled \ locked up (nothing modfied or installed since previous update, no network \ disk etc error). Tried some obvious fix attempts etc, but it needed the full DISM \ SFC route before things went back to normal. Some positive, was "interesting to get the opportunity" 😀 to put dism \ sfc on trial, performed very well.
Ironically, the "newest and best" = my first OS DISM \ potential reinstall - restore from backup situation in a dozen+ years (never ever needed with w8.1 pro, 10 ltsc 2019 \ 2021).