Just working from memory here but you need to install.
http://astronomy-imaging-camera.com/...20V2.0.1.3.exe
This one show allow you to select the camera drivers you're installing and it downloads them for you. Just select all and let it do its thing.
This install this one which should be the ASI Camera ASCOM driver.
http://astronomy-imaging-camera.com/...0V1.0.2.25.exe
Not sure how compatible these drivers are with previous versions of ASCOM so I'd double check you have ASCOM 6.2 currently installed.