Why your legacy vSphere 5.5 environment doesn’t have to be a security liability.
VMware typically requires a customer account and an active support contract to download older versions. However, for vSphere 5.5, VMware has moved the binaries to the "Old Downloads" archive. vmware vsphere client 5.5 download windows 10 64 bit
Third-Party Repositories: Sites such as Prolved and VMwareArena maintain archives of official installer filenames like VMware-viclient-all-5.5.0-1281650.exe . Bridging the Gap: Running the vSphere Client 5
However, for full host/host management, the old fat client remains irreplaceable for features like: Isolate legacy management tools on a dedicated admin
From a vCenter Server 5.5 (if you have one running):
remains a critical tool. However, running this decade-old software on a modern Windows 10 64-bit machine is not always a "plug-and-play" experience.