Problems loading grasshopper on rhino 5.

Hello,

I have problems loading grasshopper 0.8.0066 on Rhino 5.0 Wip x86 version. I've read the previous posts related to this topic, but none of the solutions worked for me.

It works perfectly on rhino 4, but on 5 i receive this error : I tried the drag&drop method, or to manually install the plug-in, but it still doesn't work.

I even copied the grasshopper folder into rhino 5 plugins folder, and tried to drag it from there, and i got this message: I have no idea what else to do... i hope somebody can figure this out.

Thanks.