Just to be clear about the Kobo desktop, there are two changes.
Firstly, there is a change to an option used in the database. On Windows, the Python SQLite library used by the Obok plugin is not compatible with this change. The error displayed when using Obok will be something about an encrypted database. The change to fix this is to use apsw instead of sqlite3. Kobo also made the change to the database on the device. I have already made changes to the all the calibre plugins under my control to fix this.
Then, the encryption for the books appears to have changed.
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