Microsoft plans to release the next major update to Windows 10 in early October of 2018 (Windows 10 October 2018 Update).
The method uses the Microsoft Setup tool to download the update via some USB Flash but also directly without creating any media from the files stored on your computer.
The process is quite simple. You just need to run a command on a command prompt window with administrator permissions.
You must download two files to the downloaded computer and place them in the same folder.
Download it Media Creator for Window 10 for the previous 1803 version from Microsoft. (If the tool immediately downloads only the 1803 version and not 1809).
Download the new product.cab zip from GitHub page.
Create a new folder on the system, e.g. c: \ 1809.
Insert the MediaCreationTool1803.exe file that you downloaded into the folder, and extract the products.cab extract into the same folder.
Both files, MediaCreationTool1803.exe and products.cab, should be in the same folder.
Download the new Windows 10 to 1809
In Windows search, type cmd.exe. Hold down the Shift key and the Ctrl key on the keyboard. Select cmd.exe from the list of results with your mouse and open the application.
Let's go to the folder you created:
and run MediaCreationTool1803 with the following command:
The command will launch the Media Creation Tool and cause the application to use the local product.cab file.
When the Media Creation Tool opens, simply follow the instructions on the screen. You have the option of upgrading your computer or creating an installation tool.
Updated to add the original Media Creation Tool:
Download it directly from Microsoft: