Can't install AppDaemon (hassbian-config)

I am trying to install AppDaemon with https://github.com/home-assistant/hassbian-scripts

but when I type:
sudo hassbian-config install appdaemon
I get :

Collecting pyyaml (from appdaemon)
HTTP error 404 while getting https://www.piwheels.org/simple/pyyaml/PyYAML-4.1-cp35-cp35m-linux_armv7l.whl#sha256=a5b125a24244830d574ccfd8fab861198d2ffe491b73179ffd75abf78caee6ff (from piwheels - Links for pyyaml)
Could not install requirement pyyaml from https://www.piwheels.org/simple/pyyaml/PyYAML-4.1-cp35-cp35m-linux_armv7l.whl#sha256=a5b125a24244830d574ccfd8fab861198d2ffe491b73179ffd75abf78caee6ff (from appdaemon) because of error 404 Client Error: Not Found for url: https://www.piwheels.org/simple/pyyaml/PyYAML-4.1-cp35-cp35m-linux_armv7l.whl

I think that the correct file is:

https://www.piwheels.org/simple/**PyYAML**/PyYAML-4.1-cp35-cp35m-linux_armv7l.whl

But I have no clue how to change the URL.

Thanks

It looks like the script has a problem. I wrote some instructions a while ago for installing AD in a venv, which a few people have used: