Installation instructions needed - App Installer on Azure Windows Server 2019 Datacenter OS

Hi ln787, 

Thank you for reaching out to us with your question. The Windows Server 2019 is released without the Desktop App Installer pre-installed.

The Microsoft Business Store is the recommended approach to retrieving the installation media for the Desktop App Installer.

Step 1: Enable the Shopping experience to "Show offline apps". This is disabled by default.

Step 2: Search for the App Installer in the Microsoft Business Store, select "Offline" from the dropdown menu before selecting the "Manage" button. After that, proceed to download the App Installer and pre-requisites.

Step 3: Install the pre-requisites and App Installer using PowerShell (Add-appxpackage -Path <Path to *.msix>).

Please note, that I choose to use the Add-AppxPackage PowerShell cmdlet. Depending on your requirements you may need to use the Add-AppxProvisionedPackage PowerShell cmdlet.

I hope that this information was helpful.