Hi everybody,
Most of you have the same problem that I had before. Now I've found the solution, for I'm using LimeWire daily since 2 years ago, so I've learnt some things. Now I have LimeWire 2.6.3, and sometimes it crashes too, but if you make a copy of the "downloads.dat" file from time to time (I mean, every 5 or 10 minutes) and you places it in another folder of your pc, though LimeWire crashes, you'll be able to substitute the "downloads.dat" folder, and then it will start to be downloaded the same files that you were before (downloads.dat contains the downloading list of files). In relation to the "same point of the downloading file", it doesn't depend on Limewire, but on the same ip which keeps the same file. Try to look for it. Thus I've finish every download. It works! Good luck everybody!