We'd like to import (or otherwise access) these old photos from when iPhoto was used. As I explained in my first post, we're directed to use iPhoto Library Upgrader tool, which tells us that there is a problem accessing one or more files in the photo library and would we like iPhoto to repair permissions.
When you try to open an iPhoto Library from many years ago and are told to run the iPhoto Library upgrader tool, your iPhoto library is in a very old format - it must have been created by iPhoto 7.1.2 or older.
To be able to run the iPhoto Library Upgrader tool without permissions problems it may help to move this library to an external volume, that has not been used for Time Machine backups and where you can set the Ignore Ownership flag: Prepare an external volume as described here: Move your Photos library to save space on your Mac - Apple Support
Then copy the old iPhoto Library to this volume and try again to open it in iPhoto Library Upgrader.
Once the library has been prepared, you should be able to open it in iPhoto 9.6.1 to repair it, or open it in Photos to convert it to a Photos Library. In your original post you wrote that you are trying to import photos - you cannot import the old iPhoto library into another library, you can just open the library in Photos or in iPhot and try to export the photos from it, so you can import the photos into your current Photos Library.
