Krypton deletes all add-ons installed in Jarvis!!

When installing Krypton 17.3 (I didn’t check previous versions), overwriting Jarvis (16.1), the installation asks if you’re sure you want to overwrite the previous installation. However, it also assures that previous customization and settings will be preserved. Actually, quite the opposite happens. ALL addons installed by the user in Jarvis are completely deleted from the computer. I VERY MUCH wonder what’s going on??