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First, the binary install version in accordance with calibre's download site is the only supported version.
Second, If you click the jobs in the lower right of calibre you can get the details of the download and conversion. This info should be posted here with spoiler tags around it (eye with a red X through it in the advanced editor.)
Third, Is your device connected when it is being downloaded? If it is it might be transferring it upon download and deleting the download from the library.
Fourth, What version of calibre are you running? Check the status bar on the bottom left of calibre.
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