Please note that your Finder cannot be locked in order to apply the FinderPatch.
To check if your Finder is locked or not, select the Finder by clicking on the icon once. Choose "Get Info" from the "File" menu, and when the info window appears, check the lower left-hand corner where it has the "Locked" checkbox. If it is checked, then your Finder is locked, and a little lock icon appears in the lower left-hand corner of the Finder's icon. To unlock it, simply uncheck the "Locked" checkbox in the info window and close the window. There should not be a lock icon on the Finder icon anymore.