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Old 02-02-2025, 05:35 PM   #1
mayanew
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Using a new version

If I upgrade my version of Calibre, will I lose access to my books? I thought I saw that stated at one time. My Calibre is 6.29 version. I am using a Windows 10 home edition. Thanks!
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Old 02-02-2025, 05:40 PM   #2
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No. New versions of calibre can read and if necessary upgrade libraries created by old versions of calibre.

I've been upgrading my installation of calibre since before 1.0. It's always been fine.
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Old 02-02-2025, 06:02 PM   #3
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You could go from v1.0 to the current version with no problem with the database.
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Old 02-02-2025, 09:31 PM   #4
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Just remember, you can't go back a release LEVEL (6 is a Level). Cabre automagically updates the data base when it finds an older version. It can not down grade a Level.
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Old 02-03-2025, 02:28 PM   #5
mayanew
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Thanks for your help!

That was fast! I think I will go ahead and upgrade to new version.
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Old 02-03-2025, 02:45 PM   #6
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Just remember, you can't go back a release LEVEL (6 is a Level). Cabre automagically updates the data base when it finds an older version. It can not down grade a Level.
If you delete the database, can you recreate the database using an older version? What will an older version do with data in the OPF it may not understand? Will it ignore it or have a problem?
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Old 02-03-2025, 03:28 PM   #7
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Surely if you delete it it is gone. Forever. Why would you ?
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Old 02-03-2025, 05:04 PM   #8
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Surely if you delete it it is gone. Forever. Why would you ?
Jon is talking about using Restore. That uses the metadata.opf file Calibre stores with each book
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Old 02-04-2025, 06:59 AM   #9
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Thank you @theducks
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Old 02-05-2025, 06:05 AM   #10
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Just remember, you can't go back a release LEVEL (6 is a Level). Cabre automagically updates the data base when it finds an older version. It can not down grade a Level.
Really? I went back to 6.15.1 from 7.something, ran a check library and all's well.
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Old 02-05-2025, 09:57 AM   #11
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Really? I went back to 6.15.1 from 7.something, ran a check library and all's well.
Generally. Sometimes the change happens near the end of the previous release.
Just don't count on it being allowed every time. There usually is a warning in development, but not every user is interested in that section.
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Old 02-05-2025, 10:32 AM   #12
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Really? I went back to 6.15.1 from 7.something, ran a check library and all's well.
If the latest 7.x is working, never ever go back. You should not do that.

Last edited by JSWolf; 02-05-2025 at 10:38 AM.
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Old 02-05-2025, 11:05 AM   #13
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Really? I went back to 6.15.1 from 7.something, ran a check library and all's well.
Major version changes such as from 6 to 7 often include database structure changes such as new tables or new columns in tables. These changes remain if you revert to a previous release; the database changes are not undone. The now-invalid changes might break calibre or plugins. Check library won't see these problems.

If and when you move forward again the changed entries will be wrong because they weren't maintained by the older version. calibre or plugins might not survive the experience.

Basically YMMV.
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Old 02-05-2025, 04:35 PM   #14
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Oh, the 7.x is working great, it's faster than 6.15.1. But the Find Duplicates plugin (1.9.7) doesn't and that's the last version doing things the way I like it.
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Old 02-07-2025, 10:30 AM   #15
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Oh, the 7.x is working great, it's faster than 6.15.1. But the Find Duplicates plugin (1.9.7) doesn't and that's the last version doing things the way I like it.
Staying with an old version of calibre when you don't want to means if you ever buy a new Reader, it won't work.

Alsom sticking with an old version because of one plugin is a rather bad idea.

Also, because version 7 changed your database, you have to go back to the latest 7.x or eventually, you may have a problem.
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