Install the official launcher from Blizzard's website . Install Starcraft 2: The base game is a free download.
To get the "full updated" version of the Protoss campaign officially: starcraft+2+legacy+of+the+void+crack+install+full+updated
Starcraft 2 received years of balance patches and engine optimizations that cracked versions often lack, leading to crashes or bugs. Install the official launcher from Blizzard's website