I'm trying to find a version of grasshopper 7.005... when ever I try to link to download it it sends me too Mcfee to download grasshoper 8 but, that requires Rhino 4 which I don't have.
I'm confused, Grasshopper 0.7 onwards require Rhino4 SR8 or Rhino5. If you have an earlier version of Rhino3 SR8 then you'll need at most Grasshopper 0.6.X.
Which version (and service release) of Rhino do you have installed and why can't you upgrade to the most recent service release? It's free and highly recommended.