Microsoft has published the Windows 10’s latest update for those who are using Windows 10 Developer’s Preview as their main system. Additionally they have updated Windows 10 ISO’s so you can download the fully updated system without the need of installing the old build, released in October, and updating manually.
Choose x64 if you have 4GB’s of memory and more, or choose x86 version if you have less than 4GB’s.
Windows 10 build 9879: x86
Windows 10 build 9879: x64
