i have no knoledge of osx but i know the meaning of "hard drive" and "space" what you need to do is find out what ur hard drive is called. on windows it is either C:, local disk, or main drive. a basic way to tell is whatever "thing" on your computer can hold the most. you need to deleete files and such off of this "thing" untill you have enough free space for the stuff u use limewire to get