Installing CSS3 Pie is pretty straightforward. The Action supplies a button which will launch Safari, download the relevant file and pen the Finder folder for you to drag the files into.
1 - Draw an HTML Box on the page and apply the Paul’s Buttons Action to it. You will get a warning window telling you that PIE has not been installed. On this window, and open the Action Palette (Window>Actions)
2 - Scroll down to the bottom of the Action and click on the Install PIE button.
7 - You can now close the Finder windows and carry on using the Action in Freeway.
Please remember - CSS3PIE offers a way of bringing some CSS3 features to Internet Explorer. Buttons can look very different in that browser to other more recent CSS3 able ones.