Once you have downloaded the RHEL 7.3 ISO, you can proceed with the installation. Here are the steps:
Do not trust random torrents or sketchy blogs offering direct ISO links. They could contain rootkits or backdoors. red hat enterprise linux 7.3 iso download
Guide to Downloading and Using Red Hat Enterprise Linux 7.3 ISO Once you have downloaded the RHEL 7
If you prefer, you can also download the RHEL 7.3 ISO from the Red Hat FTP site. To do this: red hat enterprise linux 7.3 iso download