The PowerCurve Software is a single EXE portable application. That means you just place it into a folder and run the program. Since it doesn’t store anything outside it’s folder you can even run it from an external disk or USB stick.
Do not install it in the “C:\Program Files” folder because on some Windows version the operating system will not allow creating files in the “Program Files” folder.
To keep things simple, you can create a folder in your C drive called C:\PowerCurve and extract the contents of the PowerCurve.Zip file that you downloaded to that folder. That’s it.