ZPlot.zip contains ZPlot.exe, ZPlot.hlp, registration file, and title function and bitmap. This is shareware (copyrighted) with some restrictions on distribution. See registration file for shareware details.
The sample files included with ZPlot3.12 may or may not work with ZPlot3.19 as shown, due to extensive internal changes. However, most of the sample 2D files are now included in ZPlot3.19 as part of an internal sample data base accessible through the Edit Formula window.