Not sure if it's intentional, but it looks like your sign up and submit application form got mixed up. The application requires a work email or specifically a not gmail-domain-email to apply.
You can use Dreamscene for Windows 7/8. On Windows 10, I used VideoPaper, a free tool from https://www.reddit.com/r/VideoPaper/. It hasn't been updated in a while, so it might not work anymore. Apparently, you can also use VLC to set a video as your desktop background.
I'm the same way. I usually think "why is this even news, it's not like these people were friends of this person." Then at times like these, I'm reminded what an impact his work had on my life.