same here:
sudo pip3 install appdaemon
...
2020-02-16 01:17:54.996889 INFO AppDaemon: AppDaemon Version 4.0.1 starting
2020-02-16 01:17:54.997721 INFO AppDaemon: Python version is 3.7.3
Configuration read from: /home/homeassistant/appdaemon/appdaemon.yaml
...
AttributeError: module 'astral' has no attribute 'Location'
even for minimal configuration
appdaemon:
time_zone: Europe/Berlin
latitude: 12.345
longitude: 12.345
elevation: 1