Excellent add-on! I had to make several changes to a batch of 11 Slides files with over 130 individual slides in each file, and *nothing* was tied to the theme or master slide. Aside from finding or writing my own API script, this is the ONLY option to clean up slides. I happily paid for this add-on, it is WELL worth the money given that the next best option is to write API scripts, which takes up way more time and requires expertise. I ran into one issue in Chrome on Mojave and the developer answered my question within 6-8 hours, and then chatted with me until I got it to work. Superb customer service! I am an academic and researcher, this is not a fake review. You need this add-on for very quick and easy changes that would otherwise be a giant pain. Thank you!!