If you are unable to run 5.x, run 4.23 if you can. If you cannot run 4.23, run 3.48.
If you are on an older OS that will not allow you to run Calibre 5.x and you are able to upgrade your OS, do so. If you are unable to upgrade your OS to run Callibre 5.x, save for a new computer.
The thing is, it's a good idea to be as future proof as possible instead of stuck in the past.
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