Source and authenticity: Only download installers from the vendor (Broadcom/Symantec) or an authorized corporate distribution portal. Third-party download sites can bundle malware or tamper installers.
If your organization absolutely requires version 10.5.1 for legacy compatibility, there is only one safe route: symantec encryption desktop - 10.5.1 download
If you have a valid license file but lost the installer: Source and authenticity: Only download installers from the