How can I safely migrate my photo library from Photos 1.0 back to iPhoto 9.6.1?
When I updated to the 10.10.3 update, it removed iPhoto from my dock, replacing it with the new Photos icon. I assumed wrongly that I could no longer use iPhoto & allowed Photos to migrate my photo library to itself. My photo library is huge, over 25K photos, and I've since realized I'd prefer if I'd kept the library in iPhoto, starting a new library with the Photos app, but I don't know how to put things back safely. Any suggestions?
iMac, OS X Yosemite (10.10.1)