I have in the past got that too.

get bearshare (Xolox wont do as it seems to split the files into chunks and also it needs a special file) and transfer the file to the downloaded area and continue the download. do this first as you need the data at the end of the zip file.

if after completion the file is still corrupt. hopefully you know where about the problem is??? i.e on winzip choose the test function for that zipped prog, eventually the FIRST error message will appear saying something like "crc 2345cb7a should be ffffffff", stop here and look at the screen and do not press anything.

You need to look at the status bar ont the right hand bottom of the screen. Count the blue blocks and the count the total number of blocks. Say there are 21 blue ones and the total is 25. So winzip found the problem 21 block of 25, therefore 20 blocks out of 26 are good. So now you know 80% of your file is good. All you now need to do is get rid of the last 20%.

Obtain hexedit (shaerware) and cut off the last 20%, transfer the file to the downloaded area again and continue the download.