Please do a search on the forums before you post a question like this. I have lost track of the number of threads that answer this question for you. We really don't need another one. Search terms such as N97, 5800, Symbian... will produce a wealth of information.
BTW the answer is that Slingplayer for Symbian was only designed to run on Edition 3 and Sling are showing no interest in upgrading it to Edition 5.