Microsoft today released the Windows 10 Preview Build 20150 system update, the first update push for the Dev Channel.
The update brings new features including the Windows Linux Subsystem (WSL), GPU calculations, WSL installation and WSL updates. In addition, users can update map data in the Maps app.
Microsoft has now released an ISO image for this version. You can download Windows 10 Build 20150 from the Microsoft website.
https://www.microsoft.com/en-us/software-download/windowsinsiderpreviewadvanced?wa=wsignin1.0