Start with TexMod to get your feet wet. Once you are comfortable, back up your files and dive into the .tiger archives. And remember: if Lara turns into a rainbow-colored error message, your backup is only a copy-paste away.
For a quick overview of how to handle Tomb Raider modding tools, check out this guide:
: Download the modded patch.000.tiger file and paste it into the game folder, overwriting the original.
The .tpf file is corrupt or for a different game version. Fix: Verify your game files via Steam (Right-click Tomb Raider > Properties > Local Files > Verify integrity). Then re-download the mod.
Here's a general guide to installing mods using a mod manager:
When installing mods, keep in mind:
Search for "Gibbed Tomb Raider Tiger Tools" on GitHub or modding forums. This tool unpacks and repacks the game's proprietary files.
Lara swaps texture sets between cutscenes and gameplay. Some mods only edit one set. Fix: Look for an "All-in-one" version of the mod. Or live with it; this is a common engine limitation.