You can make your controller function return a download. So you can make a route like this:

Route::get('/download/{id}', ['uses' => 'DownloadController@getDownload']);

and then a method like this in the DownloadController

function getDownload($id) {
    $download = Download::findOrFail($id);
    $download->increment('downloads');
    return response()->download($download->filePath);
}

You can read more about this here: http://laravel.com/docs/5.1/responses#file-downloads

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