This is an experiment in using SimPlot on Intel 64 bit MacOS.
The dmg file will download but must be activated by clicking on it in the download pane of the browser or double-click on it using Finder (in the Downloads folder).
The dmg will open as an attached device (sorry--there is no installer yet for SimPlot). If a window pops up showing the SimPlot2.app file, please close it. Running SP2 from that window will only provide a temporary storage space for the application.
Using Finder, create a new sub-folder in your Applications folder (ex: SimPlot2). Drag and drop the SimPlot2.app file from the attached device to your new folder. Close the attached device (click the close button next to it in Finder).
You are now ready to use SimPlot by double-clicking the SimPlot2.app file. You may get a security warning, but allow it to continue opening the application.