@mariosipad - It's only on macOS 15 Sequoia that you need Murasaki, since none of the other plugins (that I can find) work anymore. If you have an older version of macOS, then you don't need Murasaki. You can still use the free one,
https://github.com/GenjiApp/EPUB-Plugins which was still working as of macOS 14. Note you may have to remove the quarantine attribute, since it isn't signed.