This is by far the most difficult part of using Zotero for most students. Depending on the preferred browser and computer (Mac or PC), the process will be slightly different. Zotero was originally created as a browser extension for Firefox.
Zotero is now only available as a standalone application that can work with Chrome, Safari, or Firefox browser extensions.To download Zotero, go to Zotero.org, and select the big red button that says "Download Now."
Then choose which version you want to install based on which browser you use and follow the steps provided by the Zotero website.