If you find the installation too complex, consider these alternatives:
Below is a concise, practical guide to finding, installing, and using HD texture packs for Tekken 6 (console/PC/emulated versions). I assume you want higher-resolution textures for the PS3/360/PSP/Wii/PC emulated versions; if you need a specific platform, say so. tekken 6 hd texture pack
The most common type of texture pack focuses on the stages. Tekken 6 has many interactive environments, and modders have used AI upscaling tools (like Topaz Gigapixel) to clean up the flooring and walls. If you find the installation too complex, consider