Endbote for students 8 MAC

I just purchased Endnote 8 for students.  I cannot download it because it says " You can’t open the application "EndNote 8.0> because PowerPC applications are no longer supported.  What does it mean and what can I do?  I have a new MacBook with OS X 10.9.3  and I really need this program to work.  I am in the process of writing my dissertation and really need this to work. 

Where did you purchase it from ??? – that software is at least 9 or 10 years old.  It is unlikely to work with any modern computer or software?  The current version of Endnote is X7 (or 17).  Endnote 8 was a buggy version which should have been drowned at birth and is no longer supported.  You need to get your money back.