All versions of my plugins are preserved on github. But having said that, they all have been updated to work with the versions of calibre they've always worked with AND the latest python3 versions of Calibre. One size fits all. I've been writing polyglot python for several years now, so it's second nature for me to keep things compatible with both py2/py3 as well as pyqt4/pyqt5. Brand new plugins probably won't support the old, but as long as it's trivial for me to maintain support for the older versions of calibre in my existing plugins, I'll do so.
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