xrichx saidBuy a bigger hard drive.
Anything that wont require me wasting money...can I just move my iTunes to my iPhone for a minute while I update my system? Will that work???
If you're doing an update, OSX is probably expecting several gigabytes of free space so that it has room to uncompress files, copy temp files, move stuff around, and so on. And when it's all done, all those temp files will be deleted and you get your hard drive space back.
So go ahead and uninstall a few large programs. Move all your music and porn to the icloud, or to an external hard drive. Then do the OSX update.