It opens OK for me, but i got no COOP functions. Must be my set up or i got the buttons on/off wrong. Going to try again - deeerrp.
Did you use VB with NetFrmwk.4?
If this won't open try updating your Net Framework guys.
@ccman32 everything except COOP WEAPONS works for me, and I could see two or three small minimised grey boxes on the bottom left of my screen. When the COOP hacks were clicked nothing happened.