This feature is not officially supported by Centova Technologies, nor is it well-tested.  There is, however, an undocumented option which may do what you need.  To enable it, add the following line to /home/centovacast/system/config.php, just before the last ?> line:

define('AMAZON_LOCALE','CA');

Replace CA with any of the following two-letter country codes:

• CA - Canada
• DE - Germany
• FR - France
• JP - Japan
• UK - United Kingdom
• US - United States (the default)
  

If you have previously used Centova Cast's Amazon integration using amazon.com instead of amazon.fr, you will need to run the following two SQL queries as well (using phpMyAdmin or the MySQL console) to clear out any amazon.com data:

DELETE FROM amazon_image_cache;
UPDATE tracks SET amazonid=0;

Once that's done, you will need to perform full media library updates for each stream (login to each stream, click Update media library, and then when it completes, click the Perform full media library update button on the right) to bring in the new cover information from your international Amazon site.