If you're using Nathan's GUI you really only need one of the attachments. Assuming you're on Windows, get:
soPDF_Bundle.rar
That's a .rar file, which is like a.zip file: it's an archive that bundles together other files. I think there are just two in there. You need to extract those files. If you have a program that will unpack them, you can probably just double click, or maybe right click on the file and choose "Extract" or something like that. It depends what you have installed. If that isn't doing anything, you'll need some un-raring software like
peazip, and then you can extract the files using that.
Once extracted, I think you'll have two .exe files: soPdf.exe and soPDF_frontend.exe. Clicking on the latter should get you to the screen from which you can "take it yourself"... (though you might consider creating a shortcut to it in a menu or desktop).