Can any photography buffs explain how iPhoto Library Upgrader works please.
I have photos in an old iPhoto library that I would like to convert and add to my present iPhoto library When iPhoto Library Upgrader came out I got it and haven't yet been able to use it for this intent. Every time I try to use it that I do not need to use it for this version of iPhoto, that "your library can open with the current version of iPhoto and does not need to be prepared with this tool." Every time I swithch to that old iPhoto Library and try to open one of the photos the page goes black except for a white exclamation mark inside white triangle. Can anyone here explain how I can get at the photos in the other iPhoto Library?
MacBook, OS X Mavericks (10.9)