Don't do anything other than installing the updater Stand-Alone Addon Manager for FS9 as the last thing you do. Don't replace files, don't use old files, don't do anything manually, only install that AFTER all sceneries.
I edited your post removing the wrong links, because they are outdated, and are left there just to allow older installers finding them without errors, but they don't work anymore, because they are for Esellerate, which closed in 2019. ONLY the latest FS9 Addon Manager contains the updated files, and you MUST install it as the LAST thing you do.