You can add that to your phone and get updates easily or just download directly from there. **Rooting is NOT needed, CutTheCord can be installed alongside official Discord and/or other CutTheCord branches.**
~~If you're affected by this, here's a workaround: F-Droid -> Settings -> Repositories -> Seabear, tap Share on top bar, copy to clipboard, tap Delete (next to share), then tap Add Repository. It should already be filled in (from clipboard), so add it and you should be able to get updates after that.~~
If you're affected by this, ensure that your F-Droid version is 1.7 or higher. As of time of writing, F-Droid 1.7 is alpha, and can only be downloaded by enabling Unstable Updates through Settings -> Advanced Settings.