Microsoft has made Windows 10 Fall Creators update (rs3_release) and Redstone 4 (rs_prerelease) Build 16251 available for insiders in Fast Ring. You can read full changelog of this build by clicking here. You can read fixes, improvements and known issues by clicking here.
Official ISO images of Windows 10 Build 16251 are now available. You can go to the link provided below and sign in with your insider account to download the ISO image.
Now here we are with 3rd party ISO images of Windows 10 Build 16251 for both (rs3_release) and (rs_prerelease) branches. You can also download official UUP files for Windows 10 Build 16251 and can convert it to ISO as detailed in our updated step by step tutorial here.
Windows 10 Build 16251 ISO (rs_prerelease & rs3_release):
You can download the ISO images by clicking on the below links.
Windows 10 Build 16251 UUP Files: