If you're running Fedora 15, you can also upgrade using yum:

http://fedoraproject.org/wiki/Upgrading_Fedora_using_yum#Fed...

Yes, you can upgrade that way but it's not recommended (see the warning @ the top of that page). That upgrade method isn't really tested and may or may not work depending on your system.

You'd be much better off using PreUpgrade (making sure you update your system first) [1] or the install media. If you don't want to burn a DVD or CD, you can make a bootable USB stick with the iso [2].

[1] http://fedoraproject.org/wiki/How_to_use_PreUpgrade [2] http://docs.fedoraproject.org/en-US/Fedora/16/html/Installat...