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Missing CSS Content Alerter

To alert players who are missing CSS content, no one else will see these errors.

Inside the missing content menu displays simple instructions on how the player can get CSS content into their game either by purchasing CSS on Steam or by doing it for free.

It checks if CSS is mounted, if it's not it checks if the player can see the texture skybox/de_cobble_hdrbk.vtf without it appearing as an error.