(most reliable):

https://www.dell.com/support

: If you need ESXi versions older than 8.0, they may still be hosted on the Dell Support Site .

. Dell provides these optimized images to ensure all necessary drivers for PowerEdge hardware—such as storage controllers (PERC) and network interface cards—are pre-installed and validated. Where to Download Dell Support Page

While the Broadcom portal is the primary source for the latest revisions, you can often find specific versions directly on the Dell Support site Search by Service Tag

Once you've downloaded the VMware ESXi 8 Dell customized ISO image, you'll need to burn it to a USB drive: