VSCO 1.0 has been discontinued with the release of VSCO 2: Community Edition.
Not only is VSCO 2:CE 10x larger, it has much better sound quality and many more iterations. Check it out here.
The closest/easiest version to use is Bigcat's VSTi/AU conversion, which you can find here.
If you really want to experience VSCO 1.0, you can still find it here.