MuseScore in Microsoft Store is outdated, still at 3.3.4; remove link on Download page
The MuseScore version in the Microsoft Store is still on version 3.3.4
Windows 10 users of the "S" version (School?) can install only from the Microsoft Store, so are cut off of updates currently and since quite a while.
Getting that version updated has been promissed since quite a while, yet it has not happened so far.
It might (not sure) be possible to use the PortableApp (fortunately available since 3.5, see #309861: MuseScore 3.5 is not available on the PortableApps.com site & Platform application), as a workaround