According to the announcement, Windows 10 Insider Preview Build 14393 consists of bug fixes and reliability improvements. Which is a good thing, because according to several sources, build 14393 is what Microsoft will use for the Windows 10 anniversary update.

The anniversary update will become available on August 2, and will be available for free for anyone already running Windows 10 or on the Insider Preview program. If you want it for free and you’re not yet running Windows 10, you have until tomorrow (July 29) to upgrade your Windows 7 or 8.1 computer.

Ars Technica: Windows 10 Anniversary Update is ready to go and free for just a few more days

The Verge: Windows 10 Anniversary Update: the 10 best new features