You are currently running the las version of iPhoto 7.x.x. It cannot be updated beyond this version, but on OS X El Capitan version 10.11.6 you need iPhoto 9.6.1. No other iPhoto version will run on this system. But this requires to purchase upgrade, not a free update. But Apple stopped the development of iPhoto and is no longer selling it. There is no longer any way to buy the upgrade to iPhoto '11, version 6.05.tHe last chance to do that has been in 2015, before Apple pulled iPhoto from the AppStore.
If you want access to your iPhoto Library, convert it to a Photos Library and use the Photos.app to browse your photos. Photos is the successor to iPhoto.
To be able to convert your iPhoto 7.1.2 libraries, run the iPhoto upgrader tool. This will prepare your iPhoto Libraries for the migration to Photos. This is described here:
Using the iPhoto Library Upgrader tool - Apple Support
After you prepared the iPhoto Library, launch the Photos.app while holding down the options key. This will bring up a library chooser panel. Select your iPhoto Library.