So, feel free to try out Photos - if it isn’t to your liking, at least yet, you can always go back to iPhoto - just remember that anything you do in one won’t be reflected in the other.
Click Install and it will be put back in your Applications folder. Instead, click on Purchased at the top, and it should appear on the list of applications.
All without ever having to study a manual or take a lesson. So you can instantly add dramatic effects, perfect exposure, remove red?eye, and retouch blemishes. iPhoto features powerful editing tools that are simple to learn and easy to use.
And your pictures look even more beautiful in full screen. Thanks to 64?bit support and other optimizations in OS X Mavericks, everything launches faster, imports faster, and scrolls more smoothly. You can organize your pictures using Faces, Places, and Events. iPhoto is the perfect way to manage a lifetime's worth of photos.