Which protocols are supported for the update process? (http, smb, ftp, ...)

Hi Alex1475,

You can update using the App Installer file from the web, a network share or local file share, the app installer file downloads and updates supports http/s and smb.

You can find more information here: 

App Installer file overview - https://docs.microsoft.com/en-us/windows/msix/app-installer/app-installer-file-overview

Installing from the web - https://docs.microsoft.com/en-us/windows/msix/app-installer/installing-windows10-apps-web

Setting updates with the app installer file - https://docs.microsoft.com/en-us/windows/msix/app-installer/update-settings

I hope this helps.

Cheers,

Tanaka