Hi,

When you enroll as a Windows Insider, you will be prompted to choose how quickly you receive updates by selecting either “Insider Slow” or “Insider Fast”.

If you selected “Insider Slow”, you will not be offered the latest build immediately after it is released. Once some time has elapsed to allow us to find some solutions for common issues with a particular build, it will be offered to users who selected “Insider Slow”. To get the latest build immediately:

Open the Windows Insider app on your phone and select Get preview builds. On the Enroll page, select the Fast setting.

If you selected “Insider Fast”, and you still aren’t offered the upgrade, on some devices there is a software conflict that will prevent a successful update to Windows 10 Technical Preview for phones. When this conflict is detected, no software updates will be shown for installation.

To find out if your device has this conflict, please check the OS version installed.

Navigate to Settings > About > (more info) View the OS version. If your device shows 8.10.14226.359 or greater, your device has this conflict. Devices with other OS versions do not.

Should your device have the conflict, please follow these steps to update to Technical Preview: