I have found out that after my Smartphone updated to Android 5.0.1, the Astrill VPN app no longer works. It keeps returning an error message that says “No process running.”
I wrote an email to Astrill customer support, and they rely with a beta version of the app which worked fine in my Nexus 5, Android 5.1 system.
You can give it try from following link:
Link: https://getastrill.com/downloads/AstrillVpn-2.0-Beta5.apk