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Hi and welcome to the forums.
there is only one source of downloads
probably your download was corupted or finnished prematurly.
try downloading it again. make sure that when download is complete that size matches the one written on download page.
It is something to do with our corp proxy network as I tried 5 times between the zip and tar.gz files and they were all corrupted. I tried it at home and I got it the first time. Thanks for your helps.