How to use Tasker with the new OpenVPN version?
Ok, thanks to this web. Seems that I am right and the configuration has been changed. The new settings for connecting will be:

Send Intent
Action:android.intent.action.MAIN
Cat:None
Extra:de.blinkt.openvpn.shortcutProfileName:PROFIL ENAME
Package:de.blinkt.openvpn
Class:de.blinkt.openvpn.LaunchVPN
Target:Activity


This is able to start the OpenVPN connection using a OVPN file. For disconnection, I also need to change the profile:

Send Intent
Action:android.intent.action.MAIN
Cat:None
Extra:de.blinkt.openvpn.shortcutProfileName:PROFIL ENAME
Package:de.blinkt.openvpn
Class:de.blinkt.openvpn.activities.DisconnectVPN
Target:Activity


The author comments -and it is true- that when disconnecting the application remains opened on the screen at foreground. A solution proposed on this forum for this issue is to use a not existing profile as a connection. When trying to connect to this non existing profile, the first action will be to disconnect the current one. As the profile does not exists no connection will be performed.