Thanks, that link helped a lot.
There were several newer v1 players, with the last released in early 2016. You should be able to just copy its files into your slide show directories and you’ll be working again. The player’s design will look different, but this v1 player still works on iOS 14.0.1, and Safari 14.0.
Give this a try:
Download the last Soundslides 1.x player files (here’s a zip).
Unzip the file. You should see an HTML file and a directory.
Make a copy of your “Equine Cardiology” show’s directory, then copy the items from the zip in there. The “iframe.html” file should overwrite the older, existing version.
Load the new iframe.html in your browser. Note: these old shows won’t play from your local desktop; they need to be served from a web server in order to function.
Let me know how it goes. If it doesn’t work, there are still a few things we can try.
You can change a show’s aspect ratio (under the Settings’ tab) in the new web app. A 4:3 show will still have “black bars” on the left and right, but it will export at 16:9 if that’s what you need.