It is much better to start a new thread rather than posting to thread with a potentially unrelated issue. The Zotero developers or volunteers on the forums can point you to a relevant thread if one exists. If you're new to the Zotero Forums, please read the forum guidelines and bug reporting procedures before posting.
Note that, if you rely on manual installation, you may run into problems later due to the plugin in Word becoming outdated, so it's better to figure out why automatic installation isn't working (e.g., security software blocking the installation or an incorrect Word Startup folder location) and fix the underlying problem.
While the Connector can save directly to your online library, you'll usually get better results saving to Zotero directly. If the Zotero Connector reports that Zotero is unavailable and tries to save to zotero.org, see Zotero Unavailable.
How do I get a better snapshot? Sometimes the icon for a book/article/etc doesn’t appear in the address bar right away. What’s going on? Troubleshooting Problems Saving to Zotero Why doesn't the Zotero Connector offer to save complete data from a webpage? Why doesn't Zotero have a “watch folder” feature?