Well, I'm not sure what I did, but I was able to uninstall the ss hack. Then was able to update using info from the Amazon site, then thought I could live with the original screensavers, then couldn't, so reinstalled the hack, and, amazingly, all is well. Though I never did find the folder that allowed me to pick and choose from original ss without the irritating Mac blanks in between. I'm happy where I am-- it's as far as a non-tech-savvy person like me should go, I think!