Installing addons manually is not always an easy process, so we've created this guide to help you along the way. For an automatic solution to addon installation, we encourage you to give the Curse Client a try. Windows, Mac and Linux users can manually install addons they download from Curse.com. Don't forget to use My Favorites to help you keep your addons maintained if you are not using the Curse Client.
You must first exit "World of Warcraft" completely. You can install addons while being logged into the game, but they do not load until you have exited the game and logged back in.
Downloading the AddOn
Make a folder on your desktop called "My AddOns"
Download the World of Warcraft AddOn you want to install and save the compressed files (.zip, .rar, etc.) to this folder.
Usually when you download a file it will give you a popup asking if you want to open it or download it. You want to download it. If you are not given this options try right clicking on the link and "Save As..." or "Save Target As".
Extracting the AddOn
Extract one addon at a time so that you can keep track of them, and you don't accidently put files where they shouldn't go >.< .
Windows XP has a built in ZIP extractor. Double click on the file to open it, inside should be the file or folders needed. Copy these outside to the "My Mods" folder.
7-Zip: Right click the file, 7-Zip, select "Extract Here"
WinRAR: Right click the file, select "Extract Here"
WinZip: You MUST make sure the option to "Use Folder Names" is CHECKED or it will just extract the files and not make the proper folders how the Authors designed
StuffitExpander: Double click the archive to extract it to a folder in the current directory.
The AddOn will extract into a folder (or folders) with a name or subnames of the addon. For example, DBM has 14 folders once extracted. They are all marked DBM- _____. Do not merge these folders or move any files out of one and into another.
Verify your WoW Installation Path
This is the location of where you have installed World of Warcraft to. By default, for Windows, it is:
C:\Program Files\World of Warcraft\
C:\Users\Public\Games\ World of Warcraft\
However, some people have their harddrive partiant or have multiple drives so World of Warcraft may be installed on a different pathing.
For Mac, you will use this location:
Macintosh HD/Applications/World of Warcraft/
Install the AddOns
Open your World of Warcraft folder that you found above.
Go into the "Interface" folder > "AddOns" folder.
Open the "My AddOns" folder and move the extracted folders (example DBM-Brewlers) in your "My AddOns" folder into the "AddOns" folder.
Making sure AddOns are Installed
Start World of Warcraft and log in.
At the Character Select screen, look in lower left corner for the "addons" button.
If button is there: make sure all the mods you installed are listed, and make sure "load out of date addons" is checked (located towards the top).
If the button is NOT there: means the addon did not install properly.
Log out of WoW and double check to make sure you copied over the addon file to the correct folder.
If you continue to have issues you might want to consider giving the Curse Client a try.