How to install forticlient on a Linux machine without gui so the client doesn't constantly expire

I'm looking for an install path to install forticlient on Linux without gui so that it doesn't require licensing. Installing on Windows or Linux with gui allows you to select the free option checkbox to prevent license requirements. In Windows you can change a registry key but where is that value stored in Linux? How can I get this installed in a similar manner, on a Linux system without gui, so that it doesn't constantly expire and require reinstall?