With Zotero 7, there have been reported issues updating the Word Processor plug-in. For detailed help, access the forum page: https://www.zotero.org/support/word_processor_plugin_troubleshooting
Available for both Microsoft Word, Google Docs, and Libreoffice, the Zotero word processor plugin allows for automatic, real-time creation of in-text citations and bibliographies in your documents.
More information about installing and using the plugin can be found on Zotero's documentation page.