Instead of risky downloads, you can access the game safely through these official channels:
If you prefer owning your games without digital rights management, GOG.com frequently hosts sales for the digital deluxe version. Game Overview & System Requirements
During major seasonal events, the game often sees discounts of up to 80-90% on Steam .
Prey has been featured as a "Free Game of the Week" on the Epic Games Store in the past. It is worth checking their weekly rotations to see if it returns.