The msxml version needed does not depend on the operating system you use, it depends on the version the SDK tools were build against.
OK, so IIUC, according to the above linked FSDev FS2Kx (FSX) SDK Installation Wiki article:
https://www.fsdeveloper.com/wiki/index.php?title=SDK_Installation_(FSX)
...to use the FS2Kx SDK, MS-XML4.x must be manually installed into a new default installation of Windows 10, and the MS "XML4" link (which is now redirected by MS to ads etc, should instead link to the XML4.x SP3 security update:
https://www.microsoft.com/en-us/download/details.aspx?id=36292
I also found a confirmation of this download URL via this FSDev forum thread:
https://www.fsdeveloper.com/forum/threads/download-for-msxml-4-0-sp3-installer.452814/
GaryGB
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