Install .msi through task menu

You could do it now via a PowerShell script.

```
$source = "http://example.com/path/to/installer.msi"
$dest = "$PSScriptRoot\installer.msi"

$client = New-Object System.Net.WebClient
$client.DownloadFile($source, $dest)

msiexec /i "$PSScriptRoot\installer.msi" /quiet
```