Download the new RouterOS 6.8 release over the torrent network: http://www.mikrotik.com/download/routeros-ALL-6.8.torrent

Otherwise please visit http://www.mikrotik.com/download to pick exact version!

6.8 changelog:

*) bridge - default protocol-mode changed to RSTP for new bridges, fixed bridge mac address changing when port (with lowest mac address) goes down

*) userman - improve startup time;

*) sstp client - support server name verification from certificate;

*) wireless - improved 11n and nv2 stability;

*) dhcp client - support interfaces in bridge;

*) dhcp - parse decimal strings and IP addreses in options value;

*) bgp - don't show community 'internet' in BGP advertisements;

*) ipsec - enable hardware acceleration for aes-cbc + md5|sha1|sha256 aead on tilera cpus;

*) ospf - fixed checksum calculation for OSPFv3 AS-external-LSAs;

*) default configuration - changed dhcp server lease time to 10 minutes;

*) fixed port isolation on CRSs (bug introduced in v6.6);

*) smb - added support for SMB 2.002

*) timezone information updated;

*) ppp - fixed ppp bridging (did not work since v6.6);

*) improved speed of PPP, PPPoE, PPTP & L2TP on multicore routers;

*) address-list - fix crash when adding two identical address list entries (not allowed any more);

*) fixed multicast forwarding on CCRs;

*) firewall - improved address-type matcher, and added it for ipv6 aswell;

Source