PowerPhotos can be run from anywhere on your hard drive, though usually you’ll want to store it in the Applications folder, along with the rest of the applications on your Mac. Once you’ve downloaded the PowerPhotos.zip file to your Mac, Safari should automatically unzip it in your Downloads folder. You can drag PowerPhotos from there into your Applications folder to install it. To uninstall, drag PowerPhotos from your hard drive to the trash. If you are upgrading a previous version of PowerPhotos, you can simply replace the old version with the new one, and your list of libraries and all your settings will be retained automatically. You can also use the “Check For Updates” menu item from within PowerPhotos to automatically check for, download, and install new updates.