As @mkx has written already what you want is not possible. Therefore the only way forward for you if you want to stay with MikroTik is back to the school and learn v7. Start with: Upgrading to v7 part of the documentation and follow the reading with Moving from ROSv6 to v7 with examples than go trough the rest of the documentation (including examples) with a fine comb.
Also you may want to read relevant parts of the forums that might prove useful in adapting v7, such as: How to: Edge router and BNG optimization for ISPs.
Also @rextended described the process of how to get rough guide to configure your new CCR2116s to which I would only add that for obvious reasons replace 7.7 with 7.13.1 wherever it is in that guide.