It sounds like you're encountering an error or requirement related to needing version 1.16.3 (often written as v1163) for a specific mod, server, or tool (like Content Manager, Custom Shaders Patch, or SOL/CSP). The message indicates your current content is "obsolete."
Verifying Steam files removes your CSP. You must reinstall it. It sounds like you're encountering an error or
Why is this happening? Is your game truly "obsolete"? or tool (like Content Manager