You may find "free" versions on abandonware or pirate sites. However, these are . Downloading from these sources carries security risks and may provide an unstable version of the game. For a safe and legal experience, purchasing the game during a sale (where it often costs less than $2) is the best option.
If you download the game, it is highly recommended to use the open-source engine port. Arx Fatalis Free Game Download Full
: It fixes many bugs found in the original 2002 release, improves performance on modern Windows/Linux systems, and adds support for widescreen resolutions. You may find "free" versions on abandonware or pirate sites
: Often available for a low price and frequently included in seasonal sales. GOG.com : Offers a DRM-free version of the game. improves performance on modern Windows/Linux systems