You need a program that can unpack .rar files for this. If you don't have one you can find it here http://www.rarlab.com/

Notes: This file contains the complete new version. It can be run as a stand-alone program for demonstration/instruction, however some of the features cannot be enabled unless connected to a Magnum with the 
required hardware upgrade.

Login name or password
is not required for the basic version. 

SF Pressure Drop (self extracting *.exe)

Notes: A very handy program to calculate flow, pressure drop and turbulence.