The 3D Download Button is a free Photoshop Template that can be used on web pages, smart phone apps etc. Its vector and highly customizable as per needs.
How to Edit/Customize
1. Unzip the downloaded zip archive.
2. Open the .psd file in Photoshop
3. Each graphic, text, image, shape has its own layer.
4. Select desired layer to customize it.
5. Export to your desired format.