Download the new RouterOS 6.0rc9 release over the torrent network: http://www.mikrotik.com/download/routeros-ALL-6.0rc9.torrent
Otherwise please visit http://www.mikrotik.com/download to pick exact version!
6.0rc9 changelog:
*) ospf - fixed Summary-LSA prefix length check for OSPFv3, was not accepting valid LSAs;
*) certificates - fix broken certificate handling (bug introduced in rc8) in all related programs;
*) fixed - bgp tcp-md5-key crash on CCR;
*) fixed interfaces list sometimes showing up empty;
*) fixed - ip addrs could be inactive for some types of interfaces which are added as bridge ports and disabled;