Official access to the ESXi 5.5 ISO is now highly restricted following Broadcom's acquisition of VMware.
Many organizations that migrated from ESXi 5.5 to newer versions still keep a "cold storage" ISO. If you work in IT, check:
: While a free version existed, VMware has recently ended the general availability of the free "vSphere Hypervisor" for newer releases. Spiceworks Community Performance & Feature Review
Understanding what ESXi 5.5 offers helps clarify why certain legacy workloads still depend on it. Specification Limit Maximum RAM per Host Maximum Virtual CPUs (vCPUs) per VM Maximum RAM per Virtual Machine Virtual Disk Format Capacity Up to 62 TB (VMFS-5) VMFS-5 Storage Enhancements
Follow the on-screen installer (blue and yellow screen). It will ask to partition the local disk and set a root password.
Finding and downloading legacy virtualization software like VMware ESXi 5.5 can be challenging. Broadcom's acquisition of VMware fundamentally changed the availability of older binaries, making official downloads difficult to locate. This comprehensive guide covers everything you need to know about safely acquiring, verifying, and deploying the VMware ESXi 5.5 ISO. The Current State of ESXi 5.5 Downloads The Official Broadcom Portal vmware esxi 5.5 iso download
Always use a command-line tool like certutil -hashfile filename.iso md5 (Windows) or md5sum filename.iso (Linux) to verify your file matches original vendor specifications before booting your server. System Requirements for ESXi 5.5
Enter a secure password. Write it down; you cannot easily reset this. Press Enter .
VMware ESXi 5.5, while a classic entry point for virtualization enthusiasts, is considered End of Life (EOL)
Server manufacturers like Dell, HPE, and IBM generated customized ESXi 5.5 ISOs containing specialized storage and network drivers. These are occasionally archived on the respective hardware manufacturer's support portals under legacy server models (e.g., PowerEdge R720 or ProLiant DL380 Gen8).
Finding an ISO for today is like looking for a vintage car part—it’s officially "end of life," but for home lab enthusiasts and legacy systems, it's still a classic. Where to Download ESXi 5.5 ISOs Official access to the ESXi 5
Reboot the server and select the virtual CD-ROM as the boot device. Step-by-Step Installation Process
Maintains a download landing page for ESXi 5.5 Update 3a.
You can still find legacy downloads by searching the Broadcom Support Portal under "VMware vSphere".
ESXi 5.5 requires an Intel or AMD x86 64-bit compatible processor with a minimum of two cores. CPU virtualization extensions (Intel VT-x or AMD-V) must be enabled in the system BIOS/UEFI. Modern Intel Xeon (Scalable Gen 3/4/5) or AMD EPYC processors are completely unsupported and lack the microcode execution instructions required by this kernel. Storage Controllers and Network Interfaces
Check the Dell Support site under the "Operating System" downloads for older servers like the R720 or R730. 3. Alternative Community Archives Legacy Intel (e.g.
Newer CPUs (post-2016) may not be compatible, resulting in a purple screen of death (PSOD).
Since the Broadcom acquisition, the traditional portal has been overhauled. Official downloads for versions as old as 5.5 are typically:
One or more Gigabit or 10Gb Ethernet controllers. Legacy Intel (e.g., e1000) and Realtek chips are natively supported.
Search the vendor's dedicated support site (e.g., Dell Support or HPE Support Center).