patse and copy addons from an installation to another

Hello guys,
I finally decided to upgrade my main Install Kodi Krypton rc1.
I have other installations of krypton rc1 at home and at work :-), then, as always in the past, I made a copy of most of my addons from one of my krypton rc1. I installed Kodi, same version made most of the basic configuration (like the flag of unknown sources), installed a couple of addons from addon browser closed kodi and than copied my backup (script, repo and various addons music / videos). I am using the installer from the blog and not the store version.
When I open Kodi all the addons installed from the addon browser are available the ones from my backup no. I did a test on another windows machine copied manually only an addon but i have the same result (with the 17 and the 17.1 rc). fortunately settings under userdata \ addon_data are recognaized so I can copy all my credentials.
i missed something? could someone explain to me.
Peppe