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ショートコードでダウンロードボタンを表示。DLプログラム付きでソースコードや画像もダウンロードできます。
*こちらの記事も参照ください

display a CSS3 download button by a simple short code. It comes with a donwloading program that let your website visitors download html, js, php, images and so on. When you make a link by regular HTML anchor tag to these source code or image file normally it is displayed within an internet browser but you can avoid that with the plugin.
*Please also see here for more information about the plugin.