Add note to enable sideloaded apps on Windows Enterprise LTSC.

[dkocher]

Resolve #625.

[AliveDevil]

It's not only Enterprise LTSC, but some range of Windows 10 versions. Just state Windows 10, it's easier.

Also: There are two locations for this setting, because Microsoft:

• https://learn.microsoft.com/en-us/windows/client-management/mdm/policy-csp-applicationmanagement#allowalltrustedapps
• https://learn.microsoft.com/en-us/windows/apps/get-started/developer-mode-features-and-debugging

So, between Windows Settings, and PowerShell add Group Policy "Computer Configuration\Administrative Templates\Windows Components\App Package Deployment\Allow all trusted apps to install".

And provide both options of setting "Allow all trusted apps to install".

# As configured by Windows Settings:
Set-ItemProperty HKLM:\SOFTWARE\Microsoft\Windows\CurrentVersion\AppModelUnlock -Name AllowAllTrustedApps -Value 1 -Type DWord

# As configured by Group Policy:
Set-ItemProperty HKLM:\Software\Policies\Microsoft\Windows\Appx -Name AllowAllTrustedApps -Value 1 -Type DWord

We'd have to verify the second one does indeed work though.