From the website:
1. You never save when leaving Google earth. Then you keep your ANE.kmz and double click the ikon each time you want to use it.
2. The alternative is that you save when leaving Google Earth when beeing asked. Now you keep the placemarks in your left panel. If you use this possibility it is important that you delete the ANE.kmz file because otherwise you will get duplicate names.
1. If you never saved before leaving Google earth you can just throw the old ANE.kmz away and use a new down loaded ANE.kmz.
2. If you saved, you have all cities listed inside Google Earth. Go to your left panel and mark My Places (if you want to get rid of all there) or all the site names from the old ANE list (if you have more to keep in My Places). Delete what you have marked. Now double click the new ANE.kmz icon and save when leaving Google Earth, if you want to keep the new placemarks. If you don't delete the old ones, there will be double names on every site in Google Earth. Delete the ANE.kmz file if you saved the placemarkes inside Google Earth.