Comment 26 for bug 381069

I'm using EPD6.0.0 with IPython 0.10 on Mac OS 10.5.8. I'm experiencing this bug, so I thought I'd edit "IPython/Debugger.py" as shown in page pointed to by the above link. However, I can't find a method called "checkline" in that file in my distribution, so I'm guessing there have been other changes since 0.10. What's the easiest way for an end-user such as myself to download this patch?