yeah flashprint should work, but it just generates an x3g file that you use from a memory card.
For usb printing you need either an early version of makerware: http://3dprintboard.com/showthread.p...Download-(x64)

Or simplify3d. It is worth the money, the only thing I use majerware for are dual extrusion prints - s3d just doesn't work for me on those.