You can try the game for free by downloading the PC Building Simulator 2 Demo on the Epic Games Store, which lets you play the first five levels of Career Mode.
The complete game is a paid title. It requires approximately 8GB for the initial download and expands to roughly 25GB once installed. download-pc-building-simulator-2-v1-00-30b
If you are looking to get started with the simulator, here are the official ways to access it: You can try the game for free by