https://www.bleepingcomputer.com/news/microsoft/how-to-download-the-windows-10-1909-iso-from-microsoft/

Now that Microsoft has released Windows 10 1909, otherwise known as the November 2019 Update, ISO disk images for this new version are also available. As it is always a good practice to have the original media for the latest version of Windows 10 available, we will explain how you can download the Windows 10 1909 ISO directly from Microsoft.

For those nor familiar with an ISO, it is sector-by-sector copy of a DVD that is stored in a disk image file. This ISO file can then be written, or burned,  to another DVD to create a replica of the original, mounted as a drive letter in Windows, or extracted by a program like 7-Zip to access the files contained in it.