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same problem here, since today (10 sept 2018)
error message for download cover or download metadate identical :
calibre, version 3.31.0
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
using Win10, surface4 pro
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