The latest Windows 10 feature update is temporarily incompatible with iCloud for Windows
The latest Windows 10 update has been rereleased since being pulled last month, and despite Microsoft touting its bug-free nature, iCloud users attempting to run the latest version of the software for Windows have been met with an unpleasant time.
Here is the official statement from the Windows Help page detailing Windows 10's update history:
Apple has identified an incompatibility with iCloud for Windows (version 126.96.36.199) where users may experience issues updating or synching Shared Albums after updating to Windows 10, version 1809. Users who attempt to install iCloud for Windows (version 188.8.131.52) on Windows 10, version 1809 will see a message stating that this version of iCloud for Windows isn’t supported, and the installation will fail. To ensure a seamless experience, Microsoft is blocking devices with iCloud for Windows (version 184.108.40.206) software installed from being offered Window 10, version 1809 until this issue has been resolved.
In this case, Microsoft "is working with Apple to provide a compatible version of iCloud for Windows 10, version 1809 in an upcoming release." The company recommends not manually updating their version of Windows 10 to 1809 until this issue is resolved if they wish to continue using iCloud.