Board Thread:LotR Mod Technical Support/@comment-36828830-20180907093019/@comment-26172435-20180907110632

You can simply launch your client with the new update of the mod and then load your old saved file. From that moment on your save will be updated to the new mod version.

Note that if you had generated chunks in regions that have changed with the new update, these will not automatically regenerate with the new mod code. So, if you had played in Near Harad before and you wish for that area to regenerate with the new update info, then you will have to manually delete the old region files that were generated for the correspondent of the map before you go there with the new mod loaded in your client.