Q: iPhoto 1.2 does not work with El Capitan and "Help" pages ignored by Apple!

Photos for Mac is not an iPhoto update, it is a completely different application.  You can open iPhoto Libraries in Photos, but the Photos Library will turn he iPhoto events into albums, because there are no events.  Instead Photos creates Moments based on the date and the location, and they are created automatically.

Have a look at the Online Help:   Photos Help

And also:   How Photos handles content and metadata from iPhoto and Aperture - Apple Support

You can continue to use iPhoto.  iPhoto 9.6.1 is working well on El Capitan.

The upgrade to EL Capitan did not uninstall iPhoto. Open your Applications folder and drag iPhoto back to the Dock.  If the icon is crossed out, try to update to iPhoto 9.6.1:

if you own an AppStore version of iPhoto you could  try to update iPhoto to iPhoto 9.6.1 as described by Barney:

https://discussions.apple.com/docs/DOC-8431

You're welcome