iCloud for Windows compatibility issue occurred in the middle of November.
Then, Microsoft decided to work with Apple to solve this issue.
Users can update or download it to use as normal now.

This issue was firstly discovered on iCloud for Windows version 7.7.0.27.
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Also, it’s possible for you to visit the Microsoft support page to see its status update.
On the other hand, as noted by 9to5Mac, Apple amended the minimum requirements for iCloud for Windows.
Over one month later, Microsoft rereleased Windows 10 1809 on November 13.

Hope these issues can be solved as soon as possible.