Apple has fixed “iCloud for Windows” so that it will now work with WIN10 v1809:

Apple releases iCloud for Windows update that works with latest version of Windows 10

Apple today has pushed an update to iCloud for Windows, bringing the app to version 7.8.1. The update comes after users reported major compatibility issues between iCloud for Windows and the latest Windows 10 October 2018 update, affecting things such as Photos syncing and many other features.

As we reported last weekend, Microsoft and Apple were working together to resolve the compatibility issues. Essentially, users trying to install iCloud for Windows on the latest Windows 10 build would see an error message, while those who already had the app installed experienced numerous issues with Photos syncing and more.

This afternoon, Apple has released iCloud for Windows version 7.8.1 that seems to fix the compatibility issues with the Windows 10 October 2018 update. Apple also updated its Windows for iCloud support page with the following:

iCloud for Windows 7.8.1 requires Microsoft Windows 7 or later; Outlook 2007 or later or (for Mail, Contacts, Calendar); and Internet Explorer 10 or later, Firefox 30 or later, or Google Chrome 28 or later (for Bookmarks).