Windows 10 – technical Preview - Failed to Download the New Preview Build

Open Run Prompt (Windows Key  +R)
Type regedit and Click OK

Navigate to the Below registry key HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\WindowsSelfHost\Applicability Retain the Below Mentioned Registry strings and delete any other registry string



•    (Default)
•    BranchName
•    ThresholdRiskLevel

Reboot the computer