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I have the same problem. It started after I downloaded v3.31. I uninstalled and reinstalled v3.30 with no success. Here is my error message:
calibre, version 3.30.0
ERROR: Download failed: Failed to download metadata. Click Show Details to see details
Traceback (most recent call last):
File "site-packages\calibre\utils\ipc\simple_worker.py", line 289, in main
File "site-packages\calibre\ebooks\metadata\sources\worker.py ", line 102, in single_identify
File "site-packages\calibre\ebooks\metadata\sources\update.py ", line 79, in patch_plugins
File "site-packages\calibre\ebooks\metadata\sources\update.py ", line 62, in patch_search_engines
File "<string>", line 11, in <module>
ImportError: No module named polyglot.builtins
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