Use APKPure App
Get OpenVPN GUI old version APK for Android
Allows you to start and stop your OpenVPN connections via GUI.
This Program allows you to start and stop your OpenVPN connections. You can set the path where your config files are and where your OpenVPN binary is.
more infos at http://www.blank-online.eu/android/openvpn_gui/
Root required!
1.1 modprobe tun is optional at startup
1.2 removes pid file
1.3 bug: other config files