Downloadable: Power to Powerpoint: some hints to improve your Powerpoint presentation.
If you have unexpected difficulties when downloading from links, do not just click the links. In stead do right mouse click (Windows & Mac) or keep mouse button depressed longer (Mac) or control click (Mac). From the popup-menu choose "Save link as" or "Download Link to Disk" and when appropriate "source" in stead of "text". Popup menu may vary with browser type, but the principle is the same.