BTW, any way to drag and drop files into winbox like on windows to transfer files from/to MikroTik box?
Unfortunately not. None at least that I am aware of. I just use a free FTP tool called Cyberduck and when you first plug up the RouterBOARD and log into the unit with Winbox, set a static IP on your Mac to 192.168.88.100 for the RouterBOARDs here lately all default to an IP of 192.168.88.1 and when you open Winbox, it tells you it has setup a quick config for you and asks if you want to keep it or clear it. I clear it but before hitting the "Clear Configuration" button, I use Cyberduck to FTP into it using that default IP address and copy any config files I need and the RouterOS version I use, clear the config, restart, and you have a fresh and clean RouterBOARD / RouterOS device with the version you want on it and config files ready to be loaded.