There is an older, 2012 version of the mod that was released for free. However, this version does not include the Xen levels, the Definitive Edition graphical updates, or the modern bug fixes. It also requires a copy of a Source engine game (like Half-Life 2 ) to run. Why Avoid "Free Download" Sites?
"Cracked" versions are common vectors for trojans, miners, and ransomware. black-mesa-definitive-edition-pc-game-free-download
Black Mesa frequently goes on sale during Steam seasonal events (like the Summer or Winter sales), often reaching discounts of 75% or more, making it extremely affordable. There is an older, 2012 version of the