Difference between the Windows 11 app "emclient" and setup version of emclient (free version)

What is the difference between the app (found in the Microsoft Store) and the setup version of emclient (free version) ? I currently have the setup version installed of the free version of emClient, found on the website of emClient.

They are the same in functionality, but for the Pro version, they differ in the licenses.

Our version uses a one-off license purchased from us. The MS Store version works on a monthly subscription you purchase through the MS Store.