Calibre y los metadatos

Tengo un problema con Calibre, y es que no encuentra nunca metadatos cuando se conecta, con ningún libro, da igual con cual lo intentes.
He desinstalado y vuelto a instalar una docena de veces el Calibre, pero sigue igual. Hace un montón de años que lo utilizo, lo he tenido instalado en ordenadores distintos y con sistemas operativos desde Windows XP hasta Windows 10, y nunca tuve éste problema.
Ahora estoy con Windows 7 64 bis y Calibre versión 3.48 de 64 bits que es la versión más moderna compatible con Windows 7 64 bits.

Por si alguien entiende, adjunto el registro del error.

Copio y pego:

calibre, version 3.48.0
ERROR: No se encontraron coincidencias: <p>No se pudo encontrar ningún libro que coincidiera con su búsqueda. Inténtelo haciendo la búsqueda <b>menos específica</b>. por ejemplo, use sólo el apellido del autor y una sola palabra del título.<p>Para ver el registro completo, pulse «Mostrar detalles».

Running identify query with parameters:
{u'timeout': 30, u'title': u'La divina comedia', u'authors': [u'Alighieri, Dante'], u'identifiers': {u'isbn': u'9788467021882', u'google': u'UtOwngEACAAJ'}}
Using plugins: Amazon.com Multiple Countries (1, 0, 0), Google (1, 1, 3), Amazon.com (1, 3, 13)
The log from individual plugins is below

****************************** Amazon.com Multiple Countries (1, 0, 0) ******************************
Found 0 results
Downloading from Amazon.com Multiple Countries took 2.85500001907
User-agent: Mozilla/5.0 (X11; Linux x86_64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/73.0.3683.86 Safari/537.36
Server: auto
Making google query: https://www.google.com/search?q=%289...azon.es&nfpr=1
Failed to find any results on results page, with title: (9788467021882 or 978-8467021882) site:www.amazon.es - Buscar con Google
No search engine results for terms: (9788467021882 OR 978-8467021882)
Trying the bing search engine instead
Making bing query: https://www.bing.com/search?q=%28978...Awww.amazon.es
Plugin Amazon.com Multiple Countries failed
Traceback (most recent call last):
File "site-packages\calibre\ebooks\metadata\sources\identify. py", line 47, in run
File "site-packages\calibre\ebooks\metadata\sources\amazon.py ", line 1386, in identify
File "site-packages\calibre\ebooks\metadata\sources\amazon.py ", line 1344, in search_search_engine
File "site-packages\calibre\ebooks\metadata\sources\amazon.py ", line 1318, in search_search_engine
File "<string>", line 247, in bing_search
ImportError: No module named scraper.simple

************************************************** ******************************

****************************** Google (1, 1, 3) ******************************
Found 0 results
Downloading from Google took 0.000999927520752
Plugin Google failed
Traceback (most recent call last):
File "site-packages\calibre\ebooks\metadata\sources\identify. py", line 47, in run
File "<string>", line 493, in identify
ImportError: No module named xml_parse

************************************************** ******************************

****************************** Amazon.com (1, 3, 13) ******************************
Found 0 results
Downloading from Amazon.com took 0.652000188828
User-agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/72.0.3626.121 Safari/537.36
Server: auto
Making google query: https://www.google.com/search?q=%289...azon.es&nfpr=1
Failed to find any results on results page, with title: (9788467021882 or 978-8467021882) site:www.amazon.es - Buscar con Google
No search engine results for terms: (9788467021882 OR 978-8467021882)
Trying the bing search engine instead
Making bing query: https://www.bing.com/search?q=%28978...Awww.amazon.es
Plugin Amazon.com failed
Traceback (most recent call last):
File "site-packages\calibre\ebooks\metadata\sources\identify. py", line 47, in run
File "<string>", line 1647, in identify
File "<string>", line 1605, in search_search_engine
File "<string>", line 1574, in search_search_engine
File "<string>", line 247, in bing_search
ImportError: No module named scraper.simple

************************************************** ******************************
The identify phase took 3.01 seconds
The longest time (2.855000) was taken by: Amazon.com Multiple Countries
Merging results from different sources
We have 0 merged results, merging took: 0.00 seconds


Muchas gracias por vuestro tiempo y paciencia.