You can download Zotero on the Zotero download page. Be sure to also install the Zotero Connector for your browser.
How do I install Zotero? MacOpen the .dmg you downloaded and drag Zotero to the Applications folder. You can then run Zotero from Spotlight, Launchpad, or the Applications folder and add it to your Dock like any other program.
After installing Zotero, you can eject and delete the .dmg file.
WindowsRun the setup program you downloaded.
Linux Official TarballDownload the tarball, extract the contents, and run zotero from that directory to start Zotero.
For Ubuntu and other distros that support .desktop files, the tarball includes a .desktop file that can be used to add Zotero to the launcher:
Move the extracted directory to a location of your choice (e.g., /opt/zotero). Run the set_launcher_icon script from a terminal to update the .desktop file for that location. .desktop files require absolute paths for icons, so set_launcher_icon replaces the icon path with the current location of the icon based on where you've placed the directory. Symlink zotero.desktop into ~/.local/share/applications/ (e.g., ln -s /opt/zotero/zotero.desktop ~/.local/share/applications/zotero.desktop)Zotero should then appear either in your launcher or in the applications list when you click the grid icon (“Show Applications”), from which you can drag it to the launcher.
You may need to re-run set_launcher_icon after certain Zotero updates. If something isn't working, it may help to remove the current symlink (~/.local/share/applications/zotero.desktop), wait a few seconds for Zotero to disappear from the launcher, and recreate it.
Debian/Ubuntu-based DistrosA longtime community member maintains zotero-deb, a lightweight wrapper for the official tarball that uses apt for installation and updates. If you're not comfortable installing tarballs or are hing trouble following the above instructions, this is what we recommend using.
Other PackagesUnofficial packages are also ailable for various distros, but note that such packages are built by third parties, and we can only provide support for the official tarball and zotero-deb. In particular, third-party packages may be sandboxed, breaking various functionality.
ChromebookTo set up Zotero on a Chromebook, see Installing on a Chromebook.
How do I upgrade to a new version?Zotero should update itself automatically by default, or you can go to the Help menu and select “Check for Updates…” to check for updates manually. You can also always manually install a new version of Zotero over your existing version without losing any data.
TroubleshootingIf you're running older software, check the system requirements to be sure Zotero is compatible with your system.
If something still isn't working, let us know in the Zotero Forums.