Sometimes it`s needed to enter captcha before loading the Terafile.co website, then you have to enter another captcha to start website download. I don`t know if it`s just me, it seems the plugin can`t work with the first captcha because FRD shows error immediately when the download taskes are started, but after retrying for several times, the downloads go well with just one captcha.
PS: proxies or not, the issue remains.