Download, install and use MEGA Android or Desktop app. Then choose to download the files with the app corresponding to the platform you're on, on the download page at MEGA (a down arrow to the right of the Download option), or copy the web-link and paste it into the app.
Yes, you will need to wait for six hours after exceeding the transfer limit, but it will automatically continue on its own, without the user having to monitor the download, or worry about it not finishing.