If the full price is a barrier, there are safer ways to acquire the game for nearly free:

Intel Core i3 with 3.3 GHz or AMD Phenom II X4 with 3.0 GHz Memory: 6 GB RAM

You cannot update a pirated game. You will be stuck with launch-day bugs that were fixed years ago in official patches.

Websites offering the full game for free usually provide "cracked" files. These bypass Steam's DRM but often come with hidden costs.