Thanks for responding, Joolsbfd.
You might want to check with the app developer or your bank if there is an app that they provide that will work on Windows 10. Based on what you mentioned, the only options are to get it via Android. The page where you are trying to get the app might only show for the Android version. May I know the name of the app and the link of their page? So we will know the next steps to proceed. I will send you a private message if you prefer not mentioning it here in the forums.
Regards,
Janette_Z