I have recently tried to install vmware esxi 7.0, but a strange error appeared:
... see attached picture ...
This was displayed after the Setup finished loading the setup files from the CD-R.
I have no idea what that means
You are trying to install ESXi on a system with a CPU that's not supported by ESXi 7.0.
Look at this URL: https://flemmingss.com/how-to-run-vmware-esxi-7-0-on-hardware-with-unsupported-cpus/