Lunarwtr's Plugin Compendium is the best way to install/update LotRO Lua plugins. It is available for Windows and Linux/Mac clients and supports most of the plugins from this site.
Windows:
http://www.lotrointerface.com/downlo...nfo.php?id=663
Mac/Linux:
http://www.lotrointerface.com/downlo...mMacLinux.html