Zotero will run on any operating system. Zotero requires Firefox 2.0 or higher. Click on the button. Installation should only take a few seconds. Once installed close Firefox completley and then re-start it. You should now see a icon at the bottom of your web browser.
When you first try to download Zotero, you may receive the following message: “Firefox prevented this site from asking you to install software on your computer.”
If you receive this message, you'll also see an “Edit options…” button. Click this button, then click “Allow” and “Close.”
Now try downloading Zotero again.