ESXi license isn't free anymore. You can download a fully functioning version of ESXi 7 or 8 that will work for 60 days.
The cores per CPU licensing threshold is now 32, so your 14 core CPU should be good.
If this is for a home lab, or something similar, you might consider a VMUG Advantage membership. It's $200 per year, and gives you a fully functional vSphere 7 or 8 license for personal use, as well as several other VMware products (vSAN, NSX, Tanzu, etc):
https://www.vmug.com/membership/vmug-advantage-membership/