Within the Battle.net Launcher, you can use the Modify Install option under the game settings to add or remove the Campaign, Zombies, or High-Resolution Assets at any time. System Requirements for PC
are frequently advertised on third-party sites, these versions are unofficial and carry significant security and performance risks. The proper and official way to manage the game's large file size is through the modular installation feature available on Battle.net Official Selective Installation Feature
Official information regarding "highly compressed" versions of Call of Duty: Black Ops Cold War