Download the new RouterOS 6.0rc13 release over the torrent network: http://www.mikrotik.com/download/routeros-ALL-6.0rc13.torrent
Otherwise please visit http://www.mikrotik.com/download to pick exact version!
6.0rc13 changelog:
*) pppoe, l2tp, pptp server - increased lcp retransmit count to 10;
*) pptp, l2tp & pppoe clients - added ability to specify keepalive timeout;
*) graphing - fixed problem were interface graphs are lost on reboot;
*) dhcpv6 - added relay;
*) sstp server - restore (disabled in rc12) test mode which allows running server without certificate;
*) lcd - added option for turning backlight on/off;
*) bgp - fix med comparison check if routes are received from iBGP peer;
*) fixed simple queues - sometimes some simple queues did not limit traffic (bug introduced in 6.0rc12);
*) allow to change arp timeout (in /ip settings);
*) added /ip neighbor discovery settings setting "default-for-dynamic" to control discovery on new dynamic interfaces (off by default);