Microsoft's Windows 10 October 2018 update was pulled back after s started reporting of deleted data post installation. The update was re-released in November, but the roll out was phased and slow, and was based on device health and compatibility of apps. However, the company has now updated its help page to confirm that all advanced s will be able to Windows 10 October 2018 version 1809 update moving forward. Advanced s are considered as those s who manually 'Check for updates' instead of waiting for it to be offered by Microsoft via a pop-up.
The page for Windows 10 October 2018 version 1809 update has been updated to announce wider availability. The page reads, "Rollout Status as of December 17, 2018: Windows 10, version 1809, is now fully available for advanced s who manually select "Check for updates" via Windows Update." This means that all the 'advanced s' who actually head to Settings > Updates and Security to manually Check for updates will be able to it. Of course, if your device is part of the incompatible list for the October 2018 update, your wait continues, and you probably won't find the update even if you check manually.
In any case, we do not recommend that you update manually, and wait for the update to be offered by Microsoft. The company only takes this proactive measure if it feels that the update is absolutely ready for commercial rollout. Given the October 2018 update's bad run so far, we wouldn't recommend you update manually.
Windows 10 October 2018 version 1809 recently updated iCloud for Windows to resolve this syncing issue.