To help me provide the most relevant content, could you clarify which of these you are interested in?
Historical files or archives of the early 2011–2012 "Alpha" versions of Counter-Strike: Global Offensive used for research or "Source preservation" projects.
A specific (and often risky) third-party software package or script bundle used for game modification.
A compressed file containing custom models, maps, or UI elements for a community project or "CS2" transition.