Hi,.
Please check next link for information about file size when using the download manager:
Notice that you need at least 3 times of the filesize, but this will change depending on the compression level of the packet.
If this is a problem, you can use another method to download (download from browser) that will create few compressed files on your harddisk.
http://tinyurl.com/d9mm7tb
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Albert Rius
Technical Support
Autodesk, Inc.