Installing:

Place RRA.u, RRA.int and RRA.ini in your Rune/System Folder.

Open your Rune.ini file, scroll down until you will find the ServerPackages part,
it should look like this(unless you changed it):
ServerPackages=Players
ServerPackages=Runei
ServerPackages=JunModel
ServerPackages=HallsOfValhalla

add this in a new line(after "ServerPackages=HallsOfValhalla"):
ServerPackages=RRA