probably because you are not using a paid service and are subject to the whims of people who might host any particular file...i.e. it sounds like the popularity of the files you mention are at a low...

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So Long and Thanks for All the Files
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Beware of the big 3 insurance companies in Texas! Read your policies carefully (maybe you'll need a lawyer) Allstate, Farmers & State Farm are overextended and their 'coverage' is worthless...a true waste of your money Read This