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JSWolf · 02-16-2021, 08:18 PM

Calibre 5 has changed the database format that Calibre uses. After running Calibre 5 and loading your library, the database format is changed. The only pre-version 5 that can read/write to the new database format is Calibre 4.23. Any older version will not work. So forget using any version of Calibre earlier then 4.23.

02-16-2021, 08:18 PM	#7
JSWolf Resident Curmudgeon Posts: 79,878 Karma: 146918083 Join Date: Nov 2006 Location: Roslindale, Massachusetts Device: Kobo Libra 2, Kobo Aura H2O, PRS-650, PRS-T1, nook STR, PW3	Calibre 5 has changed the database format that Calibre uses. After running Calibre 5 and loading your library, the database format is changed. The only pre-version 5 that can read/write to the new database format is Calibre 4.23. Any older version will not work. So forget using any version of Calibre earlier then 4.23.