Download the new RouterOS 6.7 release over the torrent network: http://www.mikrotik.com/download/routeros-ALL-6.7.torrent

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

6.7 changelog:

*) support Android usb tethering interface;

*) ipsec - added aes-gcm icv16 encryption mode;

*) wireless - improve rate selection for nstreme protocol

*) poe - new poe controller firmware for RB750UP and OmniTIK UPA;

*) ipsec - added aes-ctr encryption mode;

*) leds - inverted modem signal trigger, now it will trigger when the signal level rises above the treshold;

*) ipsec - added sha256 and sha512 support;

*) ipsec - proposal defaults changed to aes-128 and sha1 for both phase1 and phase2;

*) certificate - support ip, dns and email subject alternative names;

*) dhcpv4 server - added REMOTE_ID option variable for relayed packets;

*) ipsec - fix policy bypass on IPv6 gre, ipip, eoip tunnels when policy uses protocol filter;

*) userman - fix crash on tilera;

*) fixed hairpin nat on bridge with use-ip-firewall=yes;

*) fixed vlan on bridge after reboot having 00:00:00:00:00:00 mac address;

*) address-list - allow manually adding timeoutable entries;

*) address-list - show dynamic entry timeout;

*) fixed l2mtu changing on CCRs - could cause port flapping;

*) disabling/enabling ethernet ports did not work properly on CCRs - could cause port flapping;

*) fixed port flapping on CCR - could happen when having other than only-hardware-queue interface queue. Note that having other interface queue than only-hardware-queue dramatically reduces performace, so should be avoided if possible;

Source