After digging through VMware’s legacy portals, I found the solution. You cannot get these from the main "Download Products" page anymore, but they are archived.
Mods: Please leave this up for legacy lab users. I am not asking for cracks or keys—just the official ISO location.
[SOLVED] Where to download an official ESXi 6.0 / 6.5 / 6.7 ISO in 2024?