I just updated to ElCapitan. "Photos" hung up "preparing", then repair tool could not be recognize. Any solutions?

It's iPhoto 9.6.1

I ran the permissions repair tool in iPhoto too, as recommended in a couple of the articles and threads. However, "Photos 1.5" which came with El Capitan, just gets stuck in "preparing the library".

My experience on three different occasions, is that "Photos" stops at 11% and does not move for hours. I can try waiting "days", but that ties up a significant part of the computer, slowing it down on other work. This seems ridiculous that it should take so long. I only have about 70 G of photo files.

A concern is that reports say Apple will no longer be updating iPhoto and, at some point, will it cease to work with OS updates...

Frustrating.

Several hours of waiting, with no movement beyond 11% or 12%... Upload speed tested at 4.45 Mb per second, while download speed is around 60 Mbps.

Why would upload speed matter? I assumed that the data was just being updated on my hard drive to work with "Photos". I have not registered for iCloud storage of the photo files.

Thanks for your answers and suggestions. I will be more patient in waiting.

The question still remains, where are the files being "uploaded to" and why? It seems this should be taking place only on the hard drive... Can you offer insights into the "why's and what's happening" in the process?

Thanks again.