Advanced Quest Book
How to install an add on manually:
1.Locate your Runes of Magic Folder
2. Create a folder called Interface(if not already made)
3.Inside that make a folder called AddOns(Make sure it is spelled exactly)
4.Find where the add on was downloaded and extract it to the AddOns folder. (you may not have to extract it haven't done it manually in a long time)
5.Type /run ReloadUI() in Runes of Magic if you had it open while doing this or go into the game and it'll be installed
I'd recommend installing the curse client(at curse.com) and making an account since it does all that for you and it's really easy that way.