For the latest ESXi 9.0, you must obtain the software directly from Cisco:
You must log in to the using an account with active VMware entitlements. Navigate to My Downloads in the left-hand sidebar. vmware esxi cisco custom iso top download
This public link is valid for 7 days and shares a thread, including any personal information you added. This link or copies made by others cannot be deleted. If you share with third parties, their policies apply. Can’t copy the link right now. Try again later. For the latest ESXi 9
Download considerations and best practices For the latest ESXi 9.0