We have discussed the top sources and how to download, but we must address the elephant in the server room: security.
Running XenServer 6.5 on a production network in 2025 is akin to leaving your front door unlocked in a high-crime neighborhood.
Recommendation: Use XenServer 6.5 only in: xenserver 65 iso download top
For all other use cases, you should migrate to XCP-ng (an open-source fork of XenServer) or Citrix Hypervisor 8.2 LTS.
Citrix has officially End-of-Lifed (EOL) XenServer 6.5. As of the latest updates, the ISOs for version 6.5 are no longer indexed on the public Citrix download pages, which now focus on Citrix Hypervisor (versions 8.x and newer). We have discussed the top sources and how
Download a checksum utility (e.g., certutil on Windows, sha256sum on Linux). Compare the result with known good values.
The base ISO is not secure. Find the "XS65E" hotfix rollup. The top hotfixes include: Recommendation: Use XenServer 6
Important Note: As of November 2019, XenServer 6.5 reached its End of Life (EOL). Citrix no longer provides security patches, bug fixes, or technical support for this version. Furthermore, the official download links on Citrix.com now redirect to newer versions (Citrix Hypervisor 8.x).
However, this does not make the ISO illegal to download. Citrix (now Cloud Software Group) has historically allowed redistribution of older versions for archival purposes, provided they are not bundled with cracked licenses or modified.
Top sources for legitimate downloads include:
Warning: Avoid random BitTorrent links or "keygen" websites. Many ISO files on third-party garbage sites have been modified to include rootkits or cryptominers.