For anyone who isn't familiar, Zygor Guides is an in-game addon that provides interactive, step-by-step walkthroughs for nearly every major activity in World of Warcraft. Think of it as your in-game co-pilot. Instead of constantly alt-tabbing to look things up on Wowhead, Zygor integrates directly into your game, guiding you to maximum efficiency. Zygor Guides was founded in 2007 and is based in Beavercreek, Ohio, so you're buying from a well-established company.
World of Warcraft updates frequently; old guide files will cause UI Lua errors and broken quest steps. zygor guides download link
The Guide Viewer: The main UI element that appears in your game. For anyone who isn't familiar, Zygor Guides is
Smart Injection System: A feature that detects your character's level and suggests the best starting point. For anyone who isn't familiar