Hello warltier, you have 2 choices: * Download the 43.0.1 from the next link : https://www.mozilla.org/en-US/firefox/all/ and then from Help menu > About Firefox update/upgrade to 43.0.4 (because the latest 43.0.4 does not served from the previous link to xp with sp2) or * Download the latest 43.0.4 from the next link : https://ftp.mozilla.org/pub/firefox/releases/43.0.4/win32/ https://support.mozilla.org/kb/how-download-and-install-firefox-windows thank you