If you've recently installed MacOS 10.15.x and tried to redownload Narrative there is a chance that you go stuck on a screen that looks like this:
We are planing on releasing an update soon that will solve this issue, it isn't a big deal and we aren't putting bad software on your computer.
Don't worry though, there is a pretty easy work around for this.
1. Right click on the Narrative Application
2. Click "Open"
3. You should now see something similar to this, click "Open"
Narrative should now open. If you Narrative doesn't open please contact support here.