Install Msix Powershell All Users -

If you are sideloading an internal app, Windows blocks it. Fix: Install the certificate first.

# 1. Right-click the MSIX file -> Properties -> Digital Signatures -> Details -> View Certificate.
# 2. Or, if you have the .cer file:
Import-Certificate -FilePath "C:\Path\To\Cert.cer" -CertStoreLocation Cert:\LocalMachine\TrustedPeople

In modern Windows builds (Windows 10 1709+), Add-AppxPackage supports the -AllUsers parameter. This command attempts to stage the package for all users on the machine. install msix powershell all users

Save this as Install-CompanyApp.ps1:

# Run this script as Administrator
$msixPath = "C:\Deployment\MyApp.msix"
$certPath = "C:\Deployment\MyCert.cer" If you are sideloading an internal app, Windows blocks it
Per-machine installation requires elevation. Launch PowerShell or PowerShell Core (7+) with Run as Administrator. In modern Windows builds (Windows 10 1709+), Add-AppxPackage
# Verify elevation
if (-NOT ([Security.Principal.WindowsPrincipal] [Security.Principal.WindowsIdentity]::GetCurrent()).IsInRole([Security.Principal.WindowsBuiltInRole] "Administrator")) 
    Write-Error "This script must be run as Administrator."
    exit 1

Removal also requires machine scope.