Installing Mods
Installation of UI/Mod addon files is actually very simple. When you download a file the author usually keeps the original file path where they should be stored to function. For example...
c:\World of Warcraft\Interface\Addons\Name of UI
However this is not always the case so the best thing to do is unzip or unrar the file (depending on the compression tool used by the author) to a temp directory.
Once you have the file unzipped there will be a folder, usually called the mods name. Copy this folder and paste it into the directory...
c:\Your World of Warcraft Directory\Interface\Addons\
All custom mods have to sit inside this Addons directory for WoW to pick them up. Anywhere else and they simply won't load when you start WoW.
Can I automatically install mods?
We have created a very cool tool called UICentral which will not only install mods from the site automatically but you can also check for new versions! Groovy! Head to... http://ui.worldofwar.net/ui.php?id=2106 and download it.
Note: We are working on a new version right now and there are a few bugs in the cirrent version still.
Make sure Mods Are Enabled
Many of these mods let you know they're loaded in the chat screens as soon as you enter the game so it's always good to look there as soon as you join to see what has been loaded. You need to check this because Blizzard has included version checking on mods.
If you have downloaded a mod which has not been updated since the latest patch WoW will detect that this is the case and disable the addon. You need to enable the mod to work by checking the 'Load out of dat addons' box in addons screen in-game. Remember, not all mods need updating following a patch and some may still function perfectly well so you can always try enabling out of date addons if the mod you use has not yet been updated.
Addon Packs
Some files come as packs which are a collection of mods all put together. Again, follow the above procedure making sure you are placing the pack inside the Addons folder.
Always Remeber!
The trick to remember is that these mod files must sit inside the c:\Your World of Warcraft Directory\Interface\Addons\ directory to function.
Removing UI/Mods
Removing a mod is as simple as adding them. Just delete the mod folder directory within the Addons directory.
For example...
c:\World of Warcraft\Interface\Addons\Delete me mod.