I downloaded Yosemite OS X and when I try to select my HD (the disk) where I want to install it, the hard drive doesn't have enough space. What can I do and still have all my files? I haven't backed up...

I downloaded Yosemite OS X and when I try to select my HD (the disk) where I want to install it, the hard drive doesn't have enough space. I have a MacBook Pro bought in 2008. What can I do and still have all my files? I haven't backed up...

Freeing Up Space on The Hard Drive
  1. See Lion/Mountain Lion/Mavericks' Storage Display.
  2. You can remove data from your Home folder except for the /Home/Library/ folder.
  3. Visit The XLab FAQs and read the FAQ on freeing up space on your hard drive.
  4. Also see Freeing space on your Mac OS X startup disk.
  5. See Where did my Disk Space go?.
  6. See The Storage Display.
You must Empty the Trash in order to recover the space they occupied on the hard drive.
You should consider replacing the drive with a larger one. Check out OWC for drives, tutorials, and toolkits.
Try using OmniDiskSweeper 1.8 or GrandPerspective to search your drive for large files and where they are located.
I recommend that you also make a backup before proceeding. Just quit the installer.

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