>>723228373
>Can I use MAS to switch to LTSC
Yes and no, it's a bit more complicated
You're not using MAS to switch to IoT LTSC 2021, but you use it activate Windows with HWID after switching
Massgrave (the team behind MAS) explains how to switch to IoT LTSC 2021 without losing your files or programs here (pic related):
https://massgrave.dev/windows10_eol

The method is a bit weird because LTSC is supposed to be installed clean but apparently it works perfectly. If you have more questions about this and Windows in general, the Windows thread on /g/ can be pretty helpful: >>>/g/106855834