Enable Windows 10 Developer Mode programmatically - powershell

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)

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

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.