Installing these mods is generally straightforward. Unlike modern retail WoW, the 3.3.5 client reads data from the Data folder using priority-based naming.
Open the WTF folder and edit Config.wtf with Notepad. Add these lines to force higher texture resolution: wow 3.3.5 hd models
High-res skins for dragons, mounts, and common mobs. Installing these mods is generally straightforward