If your only reason for ESXi 5.5 is nostalgia, any of these alternatives will serve you legally and with community support.
The search for highlights a community still tethered to reliable legacy technology. However, the risks of using "hot" keys from public repositories often outweigh the rewards. If you are building a homelab, prioritize security and stability—either by using legitimate legacy keys you already own or by making the jump to modern, open-source hypervisors that don't require a hunt for license keys. esxi 55 license key github hot
Before applying a key found on a public repository, consider the following: If your only reason for ESXi 5