Quote:How to disable developer mode

Turning off the developer mode in Windows 10 is no rocket science, and what you need to do is launch the Settings app and navigate to the following path:

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Settings > Update & Security > For developers

In this screen, you should be provided with a series of developer settings, including multiple modes, as it follows:

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Microsoft Store apps
Sideload apps
Developer mode

If the Developer mode option is enabled, this is the reason the update to version 1809 starts. When you enabled this setting, Windows 10 downloaded and installed the Developer Mode package, so now you need to return to the original settings.
Fortunately, the only thing you have to do is click the option that reads Sideload apps and then when prompted to do so, click the Yes button. At this point, the developer mode should be off, so reboot your system to save the changes and then try to update your Windows 10 system once again.