: Always verify the integrity of your download using the SHA256 sum (often provided on the download page) to ensure the file has not been tampered with. Quick Setup Guide Download pfSense Community Edition
Go to https://www.pfsense.org/download/ – This is the official landing page. Pfsense 2.5.1 Download Iso
Click the appropriate link. Since pfSense 2.5.1 is older (approx 1.2GB uncompressed), the download will be fast on modern connections. The Quest for pfSense 2