From The Depths Free Download: (v3.6.3.2)

Users looking for specific older versions often do so for mod compatibility or because of specific mechanical changes they prefer. However, the most stable and feature-complete experience is always found in the latest official version available via Steam. Why Avoid Unofficial "Free" Downloads?

You will not receive official bug fixes or technical support for unofficial copies. From the Depths Free Download (v3.6.3.2)

Searching for "free downloads" of paid games often leads to "cracked" versions that carry significant risks: Users looking for specific older versions often do

You can often find the game on sale for significantly less; it has historically dropped as low as $3.99 during major promotions. From the Depths Free Download (v3.6.3.2)