The preload for Call of Duty: Infinite Warfare and Call of Duty: Modern Warfare Remastered has just been made available for PC players. The whole package weighs in at a hefty 96GB. But you can choose to divide things up and employ individual downloads of Infinite Warfare as well as the campaign and multiplayer from Modern Warfare Remastered.
Activision warns that you'll need to have 130 GB of available space on your HD to install both games fully. Call of Duty: Modern Warfare Remastered, the revamped classic Call of Duty 4: Modern Warfare, is only available as being part of the Legacy Edition of Infinite Warfare and cannot be bought separately.