I've revived a Dell R520 to use as a lab machine. Of all miracles, I actually managed to keep the CD that had the Dell-customized ESXi 6.7 installer Dell recommends for this machine. I've got it up now, but I can't get the customer support portal to give me a license key. When I pick ESXi 6.5 and go to "download and license," I end up on the 7.0 download page.
Am I just screwed?
It makes sense that 6.x licenses are no longer available since it is no longer supported,
If you buy a current version licence, you can downgrade it.
Again.. if you have a payed version of vSphere ESXi.