2. and 3. didn't work. The uninstall offers a downgrade option. I chose it, and it indeed returned me to my previous version. But as I had done work in the new version and saved it, it wouldn't open my project file. I tried uninstalling and reinstalling the software, and to my surprise, it worked. I was able to export my completed project to .mp4. Thank goodness.
I guess somewhere, some executive changed the "it's free for home non-commercial use" to "F you, pay me."