Help! swapped out OS

Oh no! You can download an image of the SD card here:

http://thepeacetreaty.org/organelle/diskimages/20160113-v1.0.img

It is a big file, 3.8GB. Unfortunately there is no easy way to burn it onto the SD card without using the command line. Do you have a Mac? Below are some instructions for doing this in OSX. Please proceed only if you are comfortable doing so, the dd command can do some serious damage if you type in the wrong disk name for example.