read this post
https://discussion.fedoraproject.org/t/how-install-signal-appimage/195139
A bug in QtWebView causes the crash.
Don’t start the installer (or quit it if you started it already). Start terminal (Konsole in KDE) and edit a config file:
sudo nano /etc/anaconda/profile.d/fedora.conf
Find this part:
# The default browser for the Web UI. webui_web_engine = slitherer
and change it to:
# The default browser for the Web UI. webui_web_engine = firefox
Close the editor (Ctrl+X → Y → Enter), and run the installer, either from a desktop launcher, or from a terminal:
liveinst
The installer should no longer crash when using drop-down lists.