From the Pale Moon forum (https://forum.palemoon.org/viewtopic.php?f=1&t=32217):
QuoteTo make it easier for some people to manage their software installs, Pale Moon is now also available in the Microsoft Store!
If you are on a version of Windows with the Microsoft Store app installed (Most Windows 10 and 11 users, at least), you can get to the Pale Moon store page with the following link:
ms-windows-store://pdp/?productid=XPDKN9FQ75F2MZ (ms-windows-store://pdp/?productid=XPDKN9FQ75F2MZ)
This has also been added to the Pale Moon website on the download page.