If the link above doesn't work for you and you can't find the app on the Microsoft Store, Samsung may have pulled it again.

the company revealed that One UI 7 will not support the Samsung DeX app on Windows. This app made it possible to seamlessly transfer files and more between devices. However, there was a ton of ...

It is important to note that it's just the Windows App that is going away, not DeX itself. If you head over to the Samsung UK website, there’s some fine print that says: The DeX for PC on ...

mirroring your apps to Windows is only supported by a select number of handsets. Most recent Samsung Galaxy phones work, as do some handsets from OnePlus and Asus. There’s a full list here ...