iPhoto Library gone after update to OSX Yosemite 10.10.3
Put another way, how do I get the new "Photos" program associated with the new OSX Yosemite v. 10.10.3 to see my former iPhoto library that is stored on an external hard drive?
Here's the full story:
This morning I updated my MacBook Air to OSX Yosemite v. 10.10.3. The update claimed that it ran successfully. Afterwards, I plugged in my iPhone to sync it to the computer. There were photos on my phone that I'd taken yesterday, so when I plugged the iPhone in to the USB cable, a program launched that I thought was iPhoto (but, as it turns out, is actually a new Apple program called simply "Photos"). I was led through a series of questions, one of which was "do you want to download your photos to iCloud?" I did not want to download my photos to the cloud; first off, I've got like 100GB of photos and second off, even if there were that much space allowed with an iCloud account, I wouldn't have wanted to take the time. After skipping that download-to-the-cloud step, the new "Photos" program downloaded the pictures taken yesterday off of my phone and deleted them from my iPhone as I'd requested. But, when the transfer from phone to computer completed, I was taken to the new Photos program and the only pictures on my account are those that were downloaded this morning from my iPhone.
Because I've got so many photos I keep my iPhoto Library on an external hard drive. I keep two additional external hard drives that back up everything every night. I am not worried about the photos being lost, but I can't figure out how to get the new "Photos" program to go find that library on my external hard drive.
All help appreciated.
MacBook Air, OS X Yosemite (10.10.3)