On November 13, Microsoft released the second update for Windows 10 Technical Preview, this is build 9879, and for those asking for the ISO file version to install the preview, Microsoft will make them available once the operating system reaches the Slow ring of the Windows Insider Program.
However, if you don’t want to wait, you can download the ISO file for the enterprise version of the Windows 10 preview, including the one for build 9879, which it seems the company is making available before it reaches the Fast ring of the Windows Insider Program.
The Windows Technical Preview ISO file is available in 32-bit and 64-bit versions, and in English, English (Great Britain), Chinese (simplified), and Portuguese.
If you’re running build 9860 on a virtual machine or spare computer, you can simply update via the Windows Update (Preview builds) and choosing the Fast ring option. But if you want to create a dual-boot and using a VHD (or VHDX), or you simply want to do a clean install, but you don’t want to wait, you can download the Windows 10 Technical Preview build 9879 (enterprise) ISO instead.
Update: After the clean installation of Windows, you’ll be promoted to activate the preview, make sure you use this product key: PBHCJ-Q2NYD-2PX34-T2TD6-233PK, as the product key for the Windows Insider Program non-enterprise won’t work in this installation.
Source Microsoft