Thank you for your repsonse...
Yeah I have restarted the game client many times but to no effect.
Ok here is what I did step-by-step;
1. Downloaded Ui to desktop and extracted to desktop.
2. Created a ui > skins folder in my LOTRO folder in my docs.
3. Copied the extracted ui from my desktop into the ui > skins folder.
Thats about it.
So here is what my path looks like;
MyDocuments > The Lord of the rings online > ui > skins > ArenUI2
Hope this helps...