Using the Installer Package
If you have a previous version of rEFIt installed in the standard location on your Mac OS X volume, you can use the installer package to upgrade to version 0.14. Just follow the steps for installation.
Note that the installer package may overwrite your customized configuration file or icons.
To manually upgrade an installation of rEFIt, just replace it with the files from the current distribution. Copy everything in the “efi” folder, only skipping the files you have customized and want to keep. Afterwards, run “enable.sh” again to make sure rEFIt is properly blessed.