brew openvpn-connect on macos fails to upgrade or remove
I also have this issue yesterday and try a lot times today. Here it goes:
rm -r /usr/local/Caskroom/openvpn-connect
brew update-reset &amp;&amp; brew update
brew install --cask openvpn-connect

if successfully installed, you can try uninstall to ensure that.
brew uninstall openvpn-connect

Hope it works for you.