No, iPhoto 9.5.1 and newer have only ever been sold from the Mac App Store. And Apple stopped selling iPhoto, after the new Photos for Mac application came out and the iPhoto development has been discontinued. You can only purchase early versions of iPhoto '11 on iLife CDs, but they can only be updated to iPhoto 9.4.3. that will work on Mountain Lion, but not Yosemite or El Capitan.
You can open your iPhoto libraries in Photos for Mac, as TD pointed out - the currently supported photo software for El Capitan.
See what to expect, when you open your library in Photos: How Photos handles content and metadata from iPhoto and Aperture - Apple Support
This User Tip describes the differences between Photos and iPhoto: Photos 1.5 vs iPhoto 9.6.1: Features and Capabilities
And here is the online help, so you can see how it is supposed to work: Photos Help