Zotero will run on any operating system.
To install, go to https://www.zotero.org/ and click the red "Download" button. Click "Install Now" and follow the instructions.
If you see the message “Firefox prevented this site from asking you to install software on your computer," click "Allow".
If you have any problems, check the Zotero installation page.
Zotero is a great tool, but not a perfect solution for all research. Check the BC Law Library's research guide for Using Legal Citation Checking and Citation Management Software Guide for more suggestions.