First, if they have Winrar and Daemon Tools already installed, just right click on the first .rar file named "Knife Draw.part1.rar" and select extract here, youll have a password window open to enter the password Dave gave you, then a winrar progress window will open up and it will extract a file into the same folder you have those 6 files saved to. You should see a new file named "Knife CAD.iso" and it should be 630MB in size. Now open Daemon Tools(Im using Daemon Tools Pro instead of Daemon Tools Lite might be slight differences but will still do the same thing) if Daemon Tools Lite opens a window go ahead and close it youll see the Daemon tool emblem in the taskbar(lower right hand corner of your screen) left click that emblem and youll see a selection named "Unmount all drives" and then either 1 or 2 virtual cd drives first click unmount all drives to make sure you dont have a file already loaded, then select the first drive, youll have a "open file" window pop up then select the newly created iso named "Knife CAD.iso". At this point it will either autorun and youll see the OMAX splash screen come up asking you to install or if you have autorun turned off open "My Computer" and under "devices with removable storage" youll see an icon that says OMAX CD either double click it or right click and open it, then install OMAX.
I hope these are thorough and easy enough to follow, if anyone needs more help just post it here or email Dave and Ill do my best to help.