There are two main legitimate methods to play these missions without a direct purchase: Do I need the full campaign pack to play nova covert ops?
StarCraft II: Nova Covert Ops is not free . While the base StarCraft II client and the Wings of Liberty campaign are free-to-play, Nova Covert Ops Starcraft 2 Nova Covert Ops Free Download
While the core multiplayer, arcade mode, and the original Wings of Liberty campaign of StarCraft II are free-to-play, Blizzard Entertainment has never made this specific DLC free. The Risks of "Free Download" Sites There are two main legitimate methods to play