Is it impossible to download files from 1-Click Hosters on Mac OSX?

No, I think the best download manager is Tucan Manager. you can use your premium accounts on 1-Click Hosters.

Tucan Manager is a free file sharing application designed for 1-Click Hosters. Fast and lightweight, Tucan is fully open-source and compatible with Windows, GNU/Linux, and MacOSX.

With Tucan's modular support for the principal Hosters, captcha resolution, interchangeable links, premium user accounts, and many other great features, you'll learn why users around the world are making the switch to free, open 1-Click Hosted file sharing.

It is FREE ! I checks the link's availability...

GET I --> http://www.tucaneando.com/