Can't launch the editor - Steam version

[Emp_Palpatine]

Hello there,

I have the steam version of the game and when I try to launch the editor, either via the Matrix launcher or by directly clicking the .exe, I have this message :

"Could not initialize STEAM manager or invalid serial key".

How could I correct this?

Thanks!

[Robert24]

I suggest trying here first: support@slitherine.co.uk

They may have you contact support at Steam.