calibre works on macOS 10.14 (Mojave) and higher.

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Previous releases of calibre are available here.

Note

Download Leopard For Macbook Pro 10.5 Hp

1. The application cannot be run from within the dmg. You must drag it to a folder on your filesystem (The Desktop, Applications, wherever).
2. In order to show calibre in a different language, open the preferences (by pressing ⌘+P) and select your language.
3. If you are using macOS older than 10.14 (Mojave), the last version of calibre that will work on your machine is 3.48, available here.
4. If you are using macOS 10.8 (Mountain Lion), the last version of calibre that will work on your machine is 2.85.1, available here.