1. Buy a PES 2017 key. For best prices, always look on :
g2a: €25.20 (look at all retailers for best prices)… both sites allow either €, $, others.
2. Click “Install Steam” from official link.
3. Once the client is installed and has started, log in with your username / password (create one if needed).
4. Once logged-in click “+ Add a game” in the bottom left corner (Or use the “Games” tab in the main menu).
5. Select “Activate a game on Steam…”
6. A screen will ask you to accept the “Steam subscriber agreement”. Click accept.
7. A window will prompt you to enter the code you purchased.
8. Steam will authenticate your code in few minutes.
9. The game is now visible in your list.
10. Click it to start the download.