No specific info about version 4.2. Please visit the main page of Filter Design on Software Informer.
Following the Download links seems to end up at aade.com, which seems to purport to be a consultancy firm.
Provides general load estimation and system-based design.
Filter Wiz PRO provides eSketch-like simulation of the filter design.
Calculates the number of in-ceiling speakers needed to cover a room.
It is designed with crude matching network & filter synthesis.
A simple means to design filters for RSPs and TSPs.
This is the software for the MCP3909 3-Phase Energy Meter Reference Design.
Following the Download links seems to end up at aade.com, which seems to purport to be a consultancy firm.