Note: Ensure you do not have "folder-in-folder" syndrome. The path should look like: World of Warcraft/Interface/AddOns/QuestHelper/QuestHelper.toc .
On the character selection screen, click the "AddOns" button in the bottom left corner and ensure Quest Helper is checked. download quest helper 3.3.5
If your game was running, close it completely and reopen it. Note: Ensure you do not have "folder-in-folder" syndrome
Ensure you didn't extract it into the _retail_ folder if you are playing on a modified client. The Interface folder must be in the same folder as Wow.exe . download quest helper 3.3.5