I've got a Mac user (yeah I know) that is having issues with setting up Endpoint Security VPN on his HighSierra OS. The message says "the installation was completed successfully", but he also gets a simultaneous error saying Failed to create TrAPI. Tried to install again without any AV running. Still the same. I'll get him to try to uninstall the AV and then test again. Not much on Google for this error though.