Actually there are 3 Masters updating older skins Dave, Starone, myself and vStyler. You can backup your skins prior to installing Jaroepz, it's not a bad idea. But I would also after doing the backup completely delete the old skin you are replacing from inside Windowblinds (right click on it and delete the skin), then install the new one. The reason for this is that in a lot of cases there may be extra files that would be leftover in the old skin after the new skin is installed, so doing a clean skin install is much better. Of course make sure you are not deleting a skin that is currently applied when you do the delete.