if you do a search and a file shows up, between the time of your search and you clicking on it to download. the host may have gone offline, and if you re-search you will see the file has gone. Hosts can switch on and off whenever they feel like it.

I would hate to suggest that some hosts find ways to show they have files but when you go to download them, you receive a "need more sourses" message and this can go on for hours of re-searching. but.... it happens and the exact reason/s why this happens are a mystery to me.

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