KitchDesigner requires approximately 100MB of hard drive space. KitchDesigner for Revit is a Revit Add-In and there are no other specific hardware requirements for KitchDesigner except for Autodesk Revit 2017 or newer to be installed.
The system hardware requirements for Autodesk Revit are shown in the link below: https://knowledge.autodesk.com/support/revit-products/learn-explore/caas/sfdcarticles/sfdcarticles/System-requirements-for-Autodesk-Revit-2017-products.html