Game stops working at LOADING Terran Mesh

I have tried all the Beta modes in both choices Rust and Rust DirectX

Nothing works, the client always freezes after I get to the game screen to pick the server, it loads the various needed things then it gets to LOADING Terran Mesh and Boom, error or it stops dead and does nothing more.

I have contacted Support but after 5 days waiting and trying various reported possible fixes nothing works.

Thanks for anybodies time who can help