Microsoft is planning to release its next big update Windows 10 at the beginning of October 2018 (Windows 10 October 2018 Update).
While it's best to wait at least a month before installing the update below, we'll see how you can download Windows 10 to the 1809 version at this time. 
The method uses Microsoft's installation media creation tool to download the update via a USB Flash somewhere but also directly without creating any installation media, from archives stored on your computer.
The process is quite simple. You just need to run a command on a command prompt window with administrator permissions.
Preparation
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.
Install it archive MediaCreationTool1803.exe you downloaded in the folder and extract the products.cab zip in 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 it application.
A command prompt window will open with administrator permissions after accepting the UAC. Make sure you have administrator rights controlling the command line window title.
Let's go to the folder you created:
cd c:\1809
and run MediaCreationTool1803 with the following command:
MediaCreationTool1803.exe /Selfhost
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.
That's it!
Updated to add the original Media Creation Tool:
Download it directly from Microsoft:
http://software-download.microsoft.com/download/pr/MediaCreationTool1809.exe
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