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Probably not. There were changes after v1.5 requiring calibre 0.9.44 or later. Try removing the plugin, restart calibre, and reinstall it. You should not lose any of your settings by doing this, they're stored separately from the plugin itself.
The only nice way to avoid this in the future is to install both calibre and plugin updates fairly soon after they're released. Upgrades are only tested (and supported) using the current versions.
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