Microsoft is now testing Windows 10 version 1803 build 17026. The new Redstone 4 Update build 17026 (10.0.17026.1000 rs_prerelease.171023-1458) was compiled on Oct 23, 2017.
Windows 10 Redstone 4 update build 17025 is now available for Fast and Skip ahead insider members. The new build comes with new features and other improvements to the OS.
Also, the build has addressed various problems including an issue where clean installing Windows while not connected to the internet might result in default Start tiles showing download arrows indefinitely rather than the expected image.
Windows 10 version 1709 (Fall Creators Update) is now available for everyone. A new cumulative update KB4043961 (OS build 16299.19) is also available for end users. The update comes with bug fixes and minor improvements.
You can download Windows 10 build 17025 ISO files from the link below.