When applying a license key to ESXi 5.5, the process is straightforward. You typically connect to the host using the C# vSphere Client—the primary management tool for that era. Once logged in, you navigate to the Configuration tab, select Software, and then click on Licensed Features. From there, you can enter the 25-digit alphanumeric key. Once assigned, the "Evaluation Mode" notice, which usually lasts 60 days, will disappear, and the host will be permanently licensed under the free tier.
Upgrade to ESXi 7.0 or 8.0 free edition, which runs well on most hardware from the last 5–7 years, and enjoy official security updates and community support. esxi 5.5 license key free
: The original VMware Customer Connect portal that used to issue these perpetual free keys has been transitioned or retired. How to Apply a License Key (If You Have One) When applying a license key to ESXi 5
VMware ESXi 5.5, while considered an obsolete and unsupported legacy version, remains a staple in some homelab environments due to its lightweight nature and support for the legacy Windows vSphere Client. Current Availability Status From there, you can enter the 25-digit alphanumeric key