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OS 10.6.5 Mac; File Firefox 3.6.13.dmg not identified; Won't download file

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Tried to download FF 3.6.13. File seemed to down load but when trying to open the file error message stated: File not recognized. Macintosh OS 10.6.5. When I when I tried to download the file again, the download ran for about a minute or so and then said unable to download.

Tried to download FF 3.6.13. File seemed to down load but when trying to open the file error message stated: File not recognized. Macintosh OS 10.6.5. When I when I tried to download the file again, the download ran for about a minute or so and then said unable to download.

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I have the same problem, and I have checked that I definitely installed the correct version for my mac...