The latest version of CMD is v6701 which is compatible with Oracle 12c. CMD v67 is compatible with Oracle 11g. Both versions are same with respective to functionality and only difference is stack compatibility.
The version S/W which you have received is not compatible with Oracle 11g. If you would like to upgrade MD first and Oracle database later, install Oracle 12C client on the new MD server (which is having CMD v6701 binaries) for connecting Oracle 11g database schema.
Else you need to request for CMD v67 binaries which are compatible with Oracle 11g.