Update deployment and maintenance will be taking place from until - Game Servers will be unavailable during this time and other services such as the website may not be available.
This guide only covers installing and mounting Counter-Strike: Source using Lambda Game Utilities. If you wish to do this process manually, you can find plenty of tutorials on the Internet on how to do this.
If you have not already, install Lambda Game Utilities: https://lambda.tf/docs/lambda/content-mounting/game-utils