Board Thread:LotR Mod Technical Support/@comment-29021580-20170214014842/@comment-25330335-20170214030435

MultiMC and the MC launcher install in different places, so don't delete your old MC. Just go ahead and download and run MultiMC, and follow some of the guides. You'll need to move your saves over from .minecraft (copy, don't cut!). You can then create instances to your heart's content.