Hello, I just migrated a 3.20 installation to the latest version (I think it is 19.05?). Here is what I did: * Backup of the Koha database, from the 3.20 installation. * New Server, where i was going to deploy the new installation. * Install Koha on the new server, with the latest version. I made sure to use the same instance name so the database would have the same name. * After the package installation, I deleted the new koha database created by the setup. *I didn't go on to the web installer*. * Create a new, empty, database with the same name. * Restore the backup of the old koha database. * Use the *koha-upgrade-schema* to upgrade the database to the latest version. * Rebuild zebra index. At this point I got a few errors on the indexing here and there, but after the process finished, everything was working OK for my library. Hope this helps -- Sent from: http://koha.1045719.n5.nabble.com/Koha-general-f3047918.html