Problems with Downloading GECO

Hi guys

I'm trying to download GECO into Rhino/Grasshopper and for some reason, I come up with this error (see attachment)

I've downloaded the GECO files and copied the geco grasshopper assembly file and the NDde.dll file and pasted them in the following directory:

My Computer - Local (C: Drive) - Program Files - Rhinoceros 4.0 - Plug-ins - Grasshopper - Components 

The version of GECO I've downloaded was geco_1.0.8.0 (for grasshopper 0.6.0059), 

it could be the wrong version I'm downloading which is the problem isn't it

The version of Rhino I have is Rhino 4.0 SR9 

I just need to find out what problems I'm having with installing GECO into Rhino/Grasshopper and how they can be resolved

Cheers