Could be because it uses pil exactly for auto-tagging. Maybe google for pil and anaconda, there should be a way to import it. Alternatively you could try to replace all references to pil in the source code with pillow. That is the newer version anaconda comes with. But I don't know, if the api is fully compatible.
You could use the "embed comic metadata" plugin in calibre to mass convert cbr to cbz. It's one of the extra actions available there.
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