Enable Windows 10 Developer Mode programmatically

Question

I know you can enable Windows 10 Developer mode interactively by going to Settings | For developers, selecting 'Developer mode' and then rebooting.

Is there a way to enable this programmatically? (eg. via PowerShell or similar so that I can include it as a step in a Boxstarter script when refreshing my developer workstation)

Protuberance

Answer 1

Turns out Nickolaj Andersen has written an article which includes just such a PowerShell script..

http://www.scconfigmgr.com/2016/09/11/enable-ubuntu-in-windows-10-during-osd-with-configmgr/

Here are the relevant lines extracted from his post:

# Create AppModelUnlock if it doesn't exist, required for enabling Developer Mode
$RegistryKeyPath = "HKLM:\SOFTWARE\Microsoft\Windows\CurrentVersion\AppModelUnlock"
if (-not(Test-Path -Path $RegistryKeyPath)) {
    New-Item -Path $RegistryKeyPath -ItemType Directory -Force
}

# Add registry value to enable Developer Mode
New-ItemProperty -Path $RegistryKeyPath -Name AllowDevelopmentWithoutDevLicense -PropertyType DWORD -Value 1

Protuberance

One additional line needed to actually enable the feature: Enable-WindowsOptionalFeature -FeatureName Microsoft-Windows-Subsystem-Linux -Online -All -LimitAccess -NoRestart – Litigious

The registry entry above fails if it already exists, better to use:reg add "HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\AppModelUnlock" /t REG_DWO RD /f /v "AllowDevelopmentWithoutDevLicense" /d "1" – Kerman

Also could modify the last line to include -Force to avoid failure if the entry already exists. e.g. New-ItemProperty -Path $RegistryKeyPath -Name AllowDevelopmentWithoutDevLicense -PropertyType DWORD -Value 1 -Force – Poser

Answer 2

I modified the accepted answer and ended up with the following script:

param([Switch]$WaitForKey)

if (([Version](Get-CimInstance Win32_OperatingSystem).version).Major -lt 10)
{
    Write-Host -ForegroundColor Red "The DeveloperMode is only supported on Windows 10"
    exit 1
}

# Get the ID and security principal of the current user account
$myWindowsID=[System.Security.Principal.WindowsIdentity]::GetCurrent()
$myWindowsPrincipal=new-object System.Security.Principal.WindowsPrincipal($myWindowsID)

# Get the security principal for the Administrator role
$adminRole=[System.Security.Principal.WindowsBuiltInRole]::Administrator

if ($myWindowsPrincipal.IsInRole($adminRole))
{
    $RegistryKeyPath = "HKLM:\SOFTWARE\Microsoft\Windows\CurrentVersion\AppModelUnlock"
    if (! (Test-Path -Path $RegistryKeyPath)) 
    {
        New-Item -Path $RegistryKeyPath -ItemType Directory -Force
    }

    if (! (Get-ItemProperty -Path $RegistryKeyPath -Name AllowDevelopmentWithoutDevLicense))
    {
        # Add registry value to enable Developer Mode
        New-ItemProperty -Path $RegistryKeyPath -Name AllowDevelopmentWithoutDevLicense -PropertyType DWORD -Value 1
    }
    $feature = Get-WindowsOptionalFeature -FeatureName Microsoft-Windows-Subsystem-Linux -Online
    if ($feature -and ($feature.State -eq "Disabled"))
    {
        Enable-WindowsOptionalFeature -FeatureName Microsoft-Windows-Subsystem-Linux -Online -All -LimitAccess -NoRestart
    }

    if ($WaitForKey)
    {
        Write-Host -NoNewLine "Press any key to continue..."
        $null = $Host.UI.RawUI.ReadKey("NoEcho,IncludeKeyDown")
    }
}
else
{
   # We are not running "as Administrator" - so relaunch as administrator
   # Create a new process object that starts PowerShell
   $newProcess = new-object System.Diagnostics.ProcessStartInfo "PowerShell";

   # Specify the current script path and name as a parameter
   $newProcess.Arguments = "-NoProfile",$myInvocation.MyCommand.Definition,"-WaitForKey";

   # Indicate that the process should be elevated
   $newProcess.Verb = "runas";

   # Start the new process
   [System.Diagnostics.Process]::Start($newProcess);

   # Exit from the current, unelevated, process
   exit
}

It automatically elevates itself, if not already running elevated and enables the optional feature mentioned by Julian Knight.

Unnatural

Very complete. Thank you. – Baron

for me I had to change if to use Select - Get-ItemProperty -Path $RegistryKeyPath | Select -ExpandProperty AllowDevelopmentWithoutDevLicense – Aliphatic