Does somebody knows how to convert from stl

Hello does somebody know how convert my file http://grabcad.com/library/lockheed-martin-bc-305/folders/222224 (convert to keyshot ) to an file for keyshot ? pleae
Hello does somebody know how convert my file http://grabcad.com/library/lockheed-martin-bc-305/folders/222224 (convert to keyshot ) to an file for keyshot ? pleae
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