The ISO download for Windows 10 October 2018 Update edition (version 1809) has been released and is now available from the Microsoft Volume Licensing Service Center (VLSC) portal. You’ll find the 64-bit ISO file with a download size of 4505 MB. The 32-bit version is also available for download (3278MB).
Here is a good article on “How to verify if you have downloaded or installed the latest version of Windows 10”. I would recommend that you check out Michael Niehaus’ blog post where he shares some important information regarding the changes with the volume license media and upgrade packages with Windows 10, starting with v1709. There is only one ISO with a single WIM (Windows Image) file that contains all the volume license images as listed below:
You can check out the known issues HERE!