While the specific version v0.21 is now largely a relic of the past, it remains a notable piece of software history within the community, representing the "golden age" of free, user-generated CS:GO cheat scripts.
The search for a "v021" link usually points to specific community-driven software repositories or legacy gaming sites. Because the game is older, finding an official download from a modern storefront is difficult. Many users turn to: bored kitty v021 link