Older Photo libraries updated but now open empty
I have a number of older photo libraries (I have one for each year) that I keep on an external drive but since upgrading my computer and updating the libraries they now either just get stuck in the update or finish updating and then open empty even though they are 12+ GB in file size. Any ideas? Can I get access to the photo files themselves at least somehow? There's years worth of photos in these that I desperately don't want to lose!
Many thanks.