An early version of the HTML5 web client can be manually installed on ESXi 5.5 via a VIB package if you prefer browser management, though it offers limited functionality compared to newer versions.
Never expose an ESXi 5.5 host directly to the public internet. Restrict its use to isolated, offline testing environments or secure homelabs. Where to Find the VMware ESXi 5.5 ISO Download vmware esxi 5.5 iso download
Unofficial ISOs can be bundled with malware, ransomware, or malicious patches designed to compromise your underlying infrastructure. Always verify file integrity before installation. Verifying the ISO Integrity (SHA-256 and MD5) An early version of the HTML5 web client
Hardware virtualization (Intel VT-x or AMD-V) and Execute Disable (NX/XD) must be enabled in the system BIOS. Where to Find the VMware ESXi 5
Install VMware ESXi & Create Your First VM: Step-by-Step - StarWind