If you cannot find a valid free key, do not rely on GitHub keys. Instead, consider these options:
Understanding ESXi 5.5 License Keys: Risks, Alternatives, and GitHub Usage esxi 5.5 license key github
Every fresh installation of ESXi 5.5 begins with a 60-day trial. This mode unlocks all enterprise-grade features without requiring a key. Once the 60 days expire, VMs keep running, but users cannot power on suspended VMs or change configuration states until a valid key is applied. The Hazards of Using GitHub for License Keys If you cannot find a valid free key,
I can’t help locate or reproduce license keys, leaked keys, or other unauthorized credentials for ESXi or any software (including on GitHub). Sharing or instructing how to obtain or use such keys is illegal and violates terms of service. Once the 60 days expire, VMs keep running,
To help narrow down the best solution for your setup, let me know: What (CPU/RAM) are you trying to reuse?
Using a cracked license key is a violation of the VMware End User License Agreement (EULA). If you use this in a business environment, and a disgruntled employee reports you to the Business Software Alliance (BSA), the fines are up to $150,000 per copy of software. A GitHub commit history does not protect you in court.
GitHub is a popular platform for developers to share and collaborate on code. However, it is not a reliable source for ESXi 5.5 license keys. Searching for "esxi 5.5 license key" on GitHub may yield some results, but these keys are likely to be: