In setting up a road warrior VPN, I ran into some trouble. The solution hinged on the meaning of "Viscosity bundle." Even if you already have Viscosity installed, you specifically want the "Viscosity Bundle" from client export.
I was trying to set up the SSL Road Warrior VPN from the documentation at https://docs.opnsense.org/manual/how-tos/sslvpn_client.html?highlight=openvpn
The big problem I had was that Viscosity needs the "Viscosity bundle" from client export. The regular OpenVPN file export will probably not work.
Despite the word "bundle," this bundle does NOT include the Viscosity installer. It is the config and certs bundled so that Viscosity can import it.
The installers have been removed a long time ago because they bloated the updates and were not maintained. All options create a bundle, which is optimised to import it into the selected application.