This is the first time in Windows 10 development that there have not been any ISOs released for a feature update. The company is almost done with the development of the Redstone 5 update, however, Microsoft didn’t release official ISOs for Redstone 5 till today.
The original version of Windows 10 Build 17713 was released on July 11, 2018. It features tons of new features and fixes. The complete change log can be found here:
To get official ISO images of Windows 10 build 17713, point your browser to the following page: