I now have a very similar problem, so am posting here rather than beginning a new thread. My Calibre version is currently 3.48 (64 bit). For a while its been 'nagging' me to update, but I haven't had any need.
I've recently bought a Kobo Libra 2 (not here yet) and none of the Kobo conversion options are for a 7" reader. Maybe I need to update? But I don't want to lose the ability to convert books from .lrf to kobo or kindle formats. Do the later versions of Calibre still support .lrf?
I don't understand what "not backwards compatible" means. Does this mean that it will completely wipe out all the books currently stored in Calibre?
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