You can download the full ISO for vSphere 8 and vCenter directly from Broadcom/VMware.
Whether you use VMUG or a trial, vSphere 8 introduces several "best" features that are worth the effort of a legal setup:
You receive 365-day evaluation licenses for nearly the entire VMware portfolio, including vSphere 8 Enterprise Plus and vCenter Server.
For a lab environment, you can technically "re-arm" or reinstall every two months to keep learning, though this is tedious. Key Features You Get with vSphere 8
While you might find repositories on GitHub claiming to offer "vSphere 8 license keys," using them is generally a bad idea for both legal and security reasons. Instead of hunting for high-risk keys, there are legitimate, professional ways to get vSphere 8 for free or at a massive discount. The Risks of "vSphere 8 License Key GitHub" Links
No key is required for the first 60 days. All features are unlocked.
Approximately $200/year (often less with discount codes).