As I understand it, the first time you drop a Cinema4d file into Unity project, it will install the Cinema 4d Converter plug-in. However, I continue to get this error in 2019.1: "Cinema 4D converter plugin installation failed. Please run Unity as an Administrator to have the plugin installed." I've tried right clicking on Unity and 'Running as Administrator', but nothing works. My guess is Unity Hub is starting in admin mode, but launching 2019.1 as non-admin. Whenever I go into ProgramFiles directory and then specific Unity versions directory, I find the Unity Editor Exe for 2019.1, but when I try to launch it, it seems Unity Hub still starts first. Anyone see this before?