: Use the built-in "Texture Compressor" to shrink game textures, freeing up video memory.
If you are looking to create new content (like skins or UI changes) rather than just tweaking settings:
: Turn off smoke from exhausts, clouds, explosion effects, and wreckage fire to reduce CPU/GPU load.
If you'd like to or learn how to install this specific version : Are you trying to increase FPS or create a visual skin ?
: Use community tools like TankExporter or Swizzler to extract and edit tank models or textures.