iCloud app cannot be installed on Windows 10
On the linked article:


  If you downloaded iTunes from the Microsoft Store on Windows 10 or aren't seeing this error message, don't use the steps in this article. Instead, learn how to remove and reinstall iTunes and related software components for Windows 7 and later. Errors like this are related to components of Windows that iTunes from the Microsoft Store on Windows 10 doesn't use.


Follow the steps found here. Make sure you uninstall everything in the right order.


  In some rare instances, you might need to remove iTunes and related software components before you reinstall iTunes or install iTunes from the Microsoft Store. If you're directed to reinstall iTunes by AppleCare, an article, or an alert dialog, you can do so by following the steps below.


Afterwards, install the software from the Microsoft Software.