The Grasshopper shipped with Rhinoceros 6 introduces a bunch of new components, some replacing the most basic ones. This feature provides an one-click solution for downgrading them, so that it can be loaded by a Rhino 5 user.
Navigate to "Pancake" menu, click "Downgrade components to Rhino 5 version"
Subtraction (with 2 inputs)
Multiplication (with 2 inputs)
Interpolate Curve (Tangent)
Pancake will notify you about these components, and only operate on downgradable ones.