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Conversion is working well in all versions so fare I can see. There is something wrong with your PC, calibre installation and/or your source file. Or maybe with your AV what prevent calibre to work.
It is impossible to give you a helpful suggestion w/o some more elementary information like your system, what kind of calibre installation you have, a more complete error log and some additional information about what you try to convert.
A first step can be to check if your AV is blocking calibre. That happens these days more often and if so you need to configure your AV to not block the program. You can also uninstall calibre, reboot your system and make a new, more or less clean installation (this will not delete your library) as additional check.
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