Add Windows 10 Enterprise LTSC installation instructions

[Copilot]

Windows 10 Enterprise LTSC lacks Microsoft Store by default, requiring alternative installation methods for Mountain Duck's MSIX package.

Changes

• Added LTSC-specific installation section with instructions for installing Windows Package Manager (winget) via Desktop App Installer
• Documented sideloading configuration using registry settings to enable app installation outside the Store
• Referenced alternative methods using built-in Add-AppxPackage and Add-AppxProvisionedPackage commands

The new section appears as an admonition box in the Windows installation tab:

:::{admonition} Windows 10 Enterprise LTSC
:class: tip

If you need a graphical installer, install the Windows Package Manager separately:

1. Download Dependencies.zip, License1.xml and the MSIXBundle from the [Package Manager repository](https://github.com/microsoft/winget-cli/releases/)
2. Extract the Dependencies.zip
3. Install Desktop App Installer by running in an elevated PowerShell window:

Add-AppxProvisionedPackage -Online -LicensePath <License1.xml filename>
-DependencyPackagePath (Get-Item x64*.appx) `
-PackagePath Microsoft.DesktopAppInstaller_8wekyb3d8bbwe.msixbundle

Alternatively, use the bundled `Dism.exe` or `PowerShell` commands such as `Add-AppxPackage` and `Add-AppxProvisionedPackage` to add or provision the Mountain Duck application bundle.

You may have to allow sideloaded apps via PowerShell in an elevated window:

Set-ItemProperty HKLM:\SOFTWARE\Microsoft\Windows\CurrentVersion\AppModelUnlock -Name AllowAllTrustedApps -Value 1 -Type DWord

:::

Original prompt

---

This section details on the original issue you should resolve

<issue_title>Windows 10 Enterprise LTSC setup instructions</issue_title>
<issue_description>The documentation for installation using MSIX should expanded for Windows 10 Enterprise LTSC

If you need a graphical installer, install the Windows Package Manager separately:

• Download Dependencies.zip, License1.xml and the MSIXBundle from the Package Manager repository
• Extract the Dependencies.zip
• Install Desktop App Installer by

Add-AppxProvisionedPackage -Online ^
  -LicensePath e53e159d00e04f729cc2180cffd1c02e_License1.xml ^
  -DependencyPackagePath (Get-Item x64\*.appx) ^
  -PackagePath Microsoft.DesktopAppInstaller_8wekyb3d8bbwe.msixbundle

Alternatively, use the bundled Dism.exe or PowerShell commands to add or provision the application bundle.
Add-AppxPackage and Add-AppxProvisionedPackage are available despite the Microsoft Store, Desktop App Installer and winget not being installed by default.

You may have to allow sideloaded apps in the Windows Settings, or via PowerShell:

Set-ItemProperty HKLM:\SOFTWARE\Microsoft\Windows\CurrentVersion\AppModelUnlock -Name AllowAllTrustedApps -Value 1 -Type DWord
```</issue_description>

## Comments on the Issue (you are @copilot in this section)

<comments>
</comments>

• Fixes Windows 10 Enterprise LTSC setup instructions #625

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