If you download it, make sure to grab the TRAOD SCU (Startup Configuration Utility) and the multipatch by fans. The original 2003 release was famously unfinished and buggy, and these community fixes are essential for a playable experience.
Search for "Tomb Raider Angel of Darkness ISO" to find original disc images preserved for archival purposes.
This site hosts older games that are no longer actively supported by their publishers. You can often find the full ISO or rip version here for free.
While not free, the game is frequently on sale for under $1.00 USD . These versions are patched to run on modern versions of Windows, which saves a lot of troubleshooting time.