One fairly common issue people have is that older addons they install do not load when they log into the game. This is usually due to the fact that World of Warcraft tags older addons as out of date and aren't automatically loaded unless you tell the game to. This typically happens after a patch, as the game client tends to mark addons as out of date at that point.

If you want to get rid of all of registries left on the program removal and don't want your Windows system is fill with redundant registries that someday may affect the system performance, you should perform a registry scan and clean with a sophisticated registry optimizer, it will help you clean all the useless and corrupted registry files on the system.
Often the name modification (or "mod" for short) is used interchangeably with AddOn. More specifically, a mod is a third-party AddOn that alters or enhances some aspect of the game's interface. Mods can perform a wide variety of tasks, including adding new buttons to the screen, altering the built-in player and party frames. In extreme cases, mods completely supplant the standard game's interface, usually offering more advanced functionality.
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