As stated in the Heading, Sep update broken the plugin:

ExtraSeating - Failed to compile: The type or namespace name 'MiniCopter' could not be found (are you missing a using directive or an assembly reference?) | Line: 31, Pos: 47

can confirm, needs a patchy please. 

156 ExtraSeating - Failed to compile: The type or namespace name 'MiniCopter' could not be found (are you missing a using directive or an assembly reference?) | Line: 31, Pos: 47

change MiniCopter to Minicopter

Changing the MiniCopter to Minicopter in the .cs file worked. Thank you!

IAMCupsOhJoe

change MiniCopter to Minicopter

That fix works for me, thanks!

Thanks! works :)