1.Right mouse button Start -> Powershell (as Admin)
2. in the Powershell (resets the Windows Store or installs it, if not already present):
wsreset -i (if necessary ignore the error message "... could not be found")
3. wait until a message pops up in the MS maintenance center
4. start MS Store briefly, if you are asked for login data, ignore and press away!
5. download and start Easyroam.MSIX, here you will be asked if you want to start the file with the MS Store --> YES!
6. after that you should see at least the APP "APP-Installer" in the MS Store --> install it now!
7. after that start the MSIX again, now the symbol should have changed.
8. a setup opens and you can install, possibly (or quite sure) you get an error message that you still have to allow in the settings "Apps cross-load"! --> DO IT! (Link is displayed in a small box in the setup window)
9. perform setup and then start the Easyroam app.