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For what its worth, I tried this but no luck. Permissions on the generated .opf file in the cache I specified seem OK but the viewer will still fail in the manner shown above. However, if I click on the cached opf outside of Calibre the viewer opens up and works correctly. Using Catalina 10.15.7 and as the original poster intimated the viewer hasn't worked on Catalina for quite a few versions.
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