Microsoft is now testing Windows 10 build 16263 for PCs internally. The new Redstone 4 build 16263.1000 (rs_prerelease.170807-1501) was compiled on August 7, 2017. The company also compiled mobile build 10.0.15241.0 on August 7.
The Windows Insider team will not release any new build this week because of a blocking bug in internal testing. The new insider build will roll out next week.
Recently, Microsoft released the Fall Creators Update build 16257.0 and Windows 10 Redstone 4 build 16257.1000 to Fast Ring insiders. The builds were released with new features, bug fixes, and improvements.
Now you can download Windows 10 build 16257 ISO from the link below.