Microsoft has also now released ISO files for Windows 10 after the latest release to Slow ring Insiders. Insider preview build 16232. If you need a clean install of the latest Slow ring-build for some reason, these files will let you do it.
Windows 10 preview build 16232 is part of the Fall Creators Update, and contains a number of goodies like My People and aspects of Microsoft's floating design. In particular, 16232 built a number of security updates coming to everyone later this fall.
Build 16232 ISO files are available for download now in different tastes from the Microsoft Insider website.