Check with your dealer. The 640 does not come with editing software but it does come with a cd that contains artlink that allows you to transfer designs from your computer to usb (I think). Even if it doesn't, you might be able to put the emb card into your pc (if you have such a port) and save to your hard drive and then save to your usb.
If you dont' have a slot to put the card, you can try connecting your 180 to your pc using the same ports, and software that you were using before (probably artlink). Open artlink on your computer, turn on your sewing machine with emb unit attached and card inserted in your emb unit, and then select File> Read from machine and transfer designs that way. You will have to do this one at a time as far as I know.
If you have never used your computer to transfer designs before, you may have to see if you were able to use artlink with macs in the first place. If not, try getting a friend who has a pc to do this for you. Then buy her breakfast, lunch and dinner.
Good luck.