Installation & first launch
First, get your environment set up. Quite your word processor and make sure that you are in a position to quite your web browser.
Now, the desktop application and word processor plugin.
Head to https://www.zotero.org/download/, download Zotero and Run the installer.
Once installation is complete, if you launch the program, you should be greeted with the following:
That's step one and four covered, as the word processor plugin is installed automatically.
The plugin works with Microsoft Office, LibreOffice, and Google Docs. More on this later.