yeah, its there! You can find TWA 1.3 in the donwload section.
You need TW 1.09 (or 1.9) and WinRAR to install it.
Installation for Win XP:
1. Unpack TWAdvanced_1.3eng.rar
2. Go to My Documents\Command & Conquer 3 Tiberium Wars\mods (create a "mods" folder if it isnt there) and move the "TWAdvanced" folder into the "mods" folder
3. Use the TW Game Browser to start the mod