update mint 14 to 15

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http://www.linuxquestions.org – New here, I know nothing about Linux, but have been using mint 14 for 8 months now since I got rid of windows 7. Best thing I ever did. I want to upgrade to mint 15. I downloaded the .iso for linux mint 15, but cannot burn to cd because it is too big to fit on cd. Suggestions? (HowTos)