Version 5.5 is remarkably "light" compared to modern hypervisors, making it ideal for systems with limited RAM.

Many users turn to platforms like in search of "exclusive" keys or scripts to activate these older versions. Here is everything you need to know about the current state of ESXi 5.5 licensing and how to manage your legacy host. The Legend of the "GitHub Exclusive" Keys

For a personal homelab, using a publicly available key is a common "don't ask, don't tell" practice. However, for any business or production environment, using a key from GitHub is a violation of EULA and could lead to significant legal and audit risks.

If you are looking for a legitimate way to license VMware products without scouring shady GitHub repositories, the program is the gold standard.