?Cacheless Download?

Hi, I have a program which basically downloads pilot weather updates which are posted in the form of large downloadable text-files. The text files are updated every few minutes. The problem i am having is that when it downloads (using downloadurltofile) for the first time, it is only 1/5th the size it will be in about 15 minutes. But i can't have my program try to repeatedly download it because it will just always use the first cached version instead of obtaining the newer update. Do you know how i can do this? Thanks you. -Brian
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