A simple Powershell script to install an app using winget when running as System. Compatible with RMMs, tested on Syncro.

wingetAsSystemViaRMM.ps1

# EDIT THESE TO CHANGE THE APP TO INSTALL
$wingetAppId = "7zip.7zip" # This script will only install an exact match, so double-check.
$customInstallerArgs = "" # These will vary by app. Check the EXE/MSI documentation.

$ResolveWingetPath = Resolve-Path "C:\Program Files\WindowsApps\Microsoft.DesktopAppInstaller_*_x64__8wekyb3d8bbwe\winget.exe"
    if ($ResolveWingetPath){
           $WingetPath = $ResolveWingetPath[-1].Path
    }

$Wingetpath = Split-Path -Path $WingetPath -Parent
cd $wingetpath
$wingetResult = .\winget.exe install -h -e --id $wingetAppId --disable-interactivity --accept-source-agreements --custom $customInstallerArgs # Add --no-upgrade here to prevent updating existing installations


if ($LASTEXITCODE -eq 0) {
    Write-Output "$wingetAppId installed succesfully."
} else {
    if ($wingetResult -match "A package version is already installed. Installation cancelled.") {
        Write-Output "$wingetAppId already installed!"
        exit 0
    } elseif ($wingetResult -match "Successfully installed") {
        Write-Output "Script errored, but $wingetAppId installed succesfully."
        exit 0
	} else {
		Write-Output $wingetResult
		exit 1
	}
}