Start small. Download the XTC Skin v4.2 and the BrntWaffles Lighting Mod first. Play for an hour. Then, when your system handles those without crashing, add the terrain textures, then the ReShade. Within a weekend, your Sims 3 will look like a game released in 2026.
: Navigate to Documents\Electronic Arts\The Sims 3\ . If it does not exist, create a folder named Mods . Download Graphical Xtc Sims 3 Mods
Do not use generic "free download" websites. Instead, use: Start small