I downloaded version 10909 yesterday, for dreambox its powerpc-tuxbox if i remember correctly, seems to work fine and as mentioned just download it and stop oscam on dm500, rename existing Oscam in /var/bin/emu to oscamold or whatever you want, ftp the (unzipped) new Oscam to the location mentioned above, change attributes to 755 and reboot the dreambox, this worked first time for me. I use DCC (dreambox control centre 2.96) to ftp files, I did notice that the new Oscam file would not ftp accross when I tried it first, press on arrow and nothing happened, took me a while to figure it out but close dcc and reopen solves it.