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DNSB · 12-28-2021, 10:07 PM

One issue you will run into is that many of your plugins may need to be updated since calibre 3 was using Python 2 whereas calibre 5 switched to Python 3. The basic install/upgrade will work but you may want to grab a list of your plugins for re-installation reference.

BTW, due to database changes, once you have upgraded to calibre 5.xx, the only older version you can revert to is 4.23.

12-28-2021, 10:07 PM	#4
DNSB Bibliophagist Posts: 46,338 Karma: 169098492 Join Date: Jul 2010 Location: Vancouver Device: Kobo Sage, Libra Colour, Lenovo M8 FHD, Paperwhite 4, Tolino epos	One issue you will run into is that many of your plugins may need to be updated since calibre 3 was using Python 2 whereas calibre 5 switched to Python 3. The basic install/upgrade will work but you may want to grab a list of your plugins for re-installation reference. BTW, due to database changes, once you have upgraded to calibre 5.xx, the only older version you can revert to is 4.23.