Zotero for Firefox fails to find ISBNs and download references

I have encountered a problem with importing citation using magic wand. When I enter ISBN I get "Zotero could not find a record for the specified identifier. Please verify the identifier and try again." I have found the ISBN at www.worldcat.org so I suppose it is a problem in Zotero.
Furhter, if I search for the book at www.worldcat.org and try to download reference using book icon in address bar I get an error directing to a page about translator issues. Manual update of translators and styles did not help.

Any help would be appreciated. Thank you
System: Windows 7, Firefox 34.0.5, Zotero for firefox 4.0.23.1
  • Try to update Zotero to current version 4.0.24.1
  • Thank you. Finally, I found out that my antivirus (Avast) is blocking any update of Zotero. I followed instructions on
    https://www.zotero.org/support/kb/addon_could_not_be_downloaded
    and after disabling the HTTPS testing by avast web shield, update was downloaded and now all works well.
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