The setup is the same. The viewer is the same. It's only in 4.x that things changed. Don't be silly and go with 3.48. I've used both 3.29and 3.48 and I would never ever go with 3.29 when I can go with 3.48.
I do run 4.20 and it works even better then 3.29 and 3.48 (which works better then 3.29).
And now due to the upcoming Python 3 version of Calibre, a lot of plugin will have their minimum version changed to something above 3.48. So you really should go with 4.20 and keep updated.
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