I tried to download yosemite but the download failed because of poor wifi connections and I tried again but I did not have enough disk space how do I get the space back from the failed download?

The failed download of Yosemite used up disk space and I can't find away to delete that because it is taking up 4 GB of space that I need to download Yosemite.

Check that your computer is compatible with Mountain Lion/Mavericks/Yosemite.
To check the model number hold down the option/alt key, go to the Apple menu and select System Information.
iMac (Mid 2007 or newer) model number 7,1 or higher
Your Mac needs:
OS X v10.6.8 or OS X Lion already installed
2 GB or more of memory (More is better - 4 GB minimum seems to be the consensus)
8 GB or more of available space
Check to make sure your applications are compatible. PowerPC applications are no longer supported after 10.6.      
Application Compatibility
Applications Compatibility (2)
Do a backup before installing.
If you can/do upgrade, I recommend you make a copy of the installer and move it out of your Applications folder. The installer self-destructs. The copy will keep you from having to download the installer again.  You can make a bootable USB stick to install using this free program.
Bootable USB Flash Drive – Diskmaker X

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