Board Thread:News and Announcements/@comment-25987328-20160324140246/@comment-26172435-20160324143442

The default minecraft launcher supports use of all possible minecraft versions by creation of dedicated profiles managed by the launcher. So, yes, you can play 1.7.10 (required for this mod) and 1.9, as you please. The only thing you need to do to switch between them is select a different launcher profile. A new launcher profile for Forge + LOTR mod can be made as described on this page. How to install Forge is explained here. Make sure you use the right Forge version. Version 10.13.2.1291 is generally stable and fit for purpose. Good luck and enjoy!