vSphere Client (Windows-based) to manage ESXi 4.1, as it does not have the modern web interface found in newer versions. Dell +4 4. Licensing Note The "Free" version of ESXi 4.1 required a license key even though it was free of charge. These keys are no longer being actively generated by Broadcom for legacy versions, so you may need an existing key from your own records or a perpetual license from that era. YouTube +2 Important