But, in rare cases, this install failed.
Microsoft said that Windows 10 v1809 install could fail if Developer Mode is enabled.
Thus, users can just turn off the Developer Mode and then set up the Windows 10 update again.
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Due to this reason, Microsoft pulled it off and fixed the issue.
More than one month later, it re-released Windows 10 version 1809.
In this situation, Microsoft temporarily blocked the update on some devices.
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iCloud for Windows compatibility issue has appeared in the new Windows 10 October 2018 update.
Find some related explanation in this post.
Microsoft has promised that it will be more transparent about the issues happen to Windows 10.
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And it actually does this.
There is a Windows Update history page.
When a new or widespread bug is reported, the company will update the history.

Do you know how to recover lost files after Windows update?
This post shows you several methods to get them back.
Why my Windows 10 wont update?
Why Windows 10 update failed?
Here we list 7 ways to fix Win 10 update error and force Windows 10 Update normally.
How to deal with this issue?
Let us see if it works for you, he wrote.
Then, the above mentioned user disabled the Developer Mode, and finally his issue disappeared.
Yes youre right, Developer Mode was the problem blocking the update.
Fixed it by going to prefs Apps & Features Manage optional features and uninstalling Windows Developer Mode.
Update 1809 worked flawlessly after that.
Some other users also reported this kind of issue on Twitter.