You can just clone the sd card with win32diskimager and reimage yours with the ad you cloned or if you only want the roms you can copy them to your pc and then copy them to your pi with winscp or the likes.
I put my brothers card in my rasberry. Connected it to my home network. And then I could see and copy the roms on to my PC desktop. Without any of the programs suggested in the guide. Then I tranfserred the roms from my PC to my rasberry with a usb stick.