Crusader Kings II: Customization Pack Minimum System Requirements:
PC:
Operating system: XP/Vista/Windows7
Processor: Intel® Pentium® IV 2.4 GHz or AMD 3500
Memory: 2 Gb RAM
Hard disk space: 2 GB Available HDD Space
Video: NVIDIA® GeForce 8800 or ATI Radeon® X1900, 512mb graphics memory required.
Resolution at least: 1024*768
Sound: Direct X-compatible sound card
DirectX®: DirectX 9

Controller support: 3-button mouse, keyboard and speakers
Special multiplayer requirements: Internet Connection for multiplayer

Mac:
Operating system: Mac OS X 10.6.8 or later
Processor: Intel Core Duo Processor (2GHz or better)
Memory: 2 GB RAM
Hard Disk Space: 2 GB
Video Card: ATI Radeon HD 6750 / NVIDIA GeForce 320 / NVIDIA GeForce
9600 or higher
Peripherals: Mouse, keyboard

Linux:
Operating system: Ubuntu 12.04 LTS
Processor: Intel Pentium 2.4 GHz or AMD 3500
Memory: 2 GB RAM
Hard Disk Space: 2 GB
Video Card: ATI Radeon HD 6750 / NVIDIA GeForce 320 / NVIDIA GeForce
9600 or higher; 1024MB graphics memory required
Peripherals: Mouse, keyboard

Requires the base game Crusader Kings II to play.

Activation on Steam

1)      Download & install the Steam client on your computer from   here.

2)      Open the Steam client, register and login. Then, locate the Games tab on the top menu. Click that and select “Activate a Product on Steam..”

       

3)      Enter your code that is showed on the orders page of eTail. Market and and follow the steps showed to activate your game.

       

4)      The game can be monitored now and you can see it on the "Library" section on Steam. You can download and install the game now.

5)      If you need more information and support, you can click here: https://help.steampowered.com/en/wizard/HelpWithSteam