For a safe and fully featured experience, it is highly recommended to acquire the game through official channels:
Purchasing officially ensures access to the latest bug fixes, multiplayer stability, and the ability to use the extensive Steam Workshop content created by the community. Game Order and Specifications Guide | PDF - Scribd construction-simulator-2015-codex
Construction Simulator 2015 allows players to take on the role of a construction contractor, managing projects and operating heavy machinery. For a safe and fully featured experience, it