I had Real
problems installing RP8 under Red Hat 9 - in the end someone pointed me to the RealPlayer 9 rpm at http://cambuca.ldhs.cetuc.puc-rio.br/xine/
which worked very well (I won't say perfectly; it did throw up the occasional glitch) under RH9. Curiously, since moving over to Fedora it's worked flawlessly.
Hope this is useful - Kev P.