High quality models, textures, animations and more takes a lot of space, like a lot a lot. But, I just installed CS2 and I think it only downloaded about 20GB

High quality models, textures, animations and more takes a lot of space, like a lot a lot. But, I just installed CS2 and I think it only downloaded about 20GB or so, that maybe decompresses to about 40GB in the end. Maybe someone else can verify what it ended up taking on disk?