Follow the below instructions to create an AstroBox Raspberry Pi image on your own SD card.
1) Download the AstroBox image for your Raspberry Pi. It can be found here: http://Astroprint.com/Downloads. Unzip the .zip file, you should see the AstroBox image file, it has a file extension of .img.
2) Install the image on your SD card.
Download Etcher for your operating system from here: https://etcher.io and select the previous .img file and the SD Card you want to use.
After installing the Astrobox image on your SD card, you are ready to set up your Raspberry Pi AstroBox.