You have download it from below codeplex link. it also includes the instructions on how to install it
Make sure you save the file in your programe files, under SQl 2012. Open the management studio and right click on database. Click on attach and get the file from yor programe files and load it. The file might automatically dublicate itself, go ahead and remove the unsucessful one, normally at the bottom. I hope this help you and thank you very much.