Before patching Linux/Unix or Macintosh, we need to configure a repository into which we can download the patches in vendor-provided format. Once they've been downloaded, we need to make them available for the machines we plan to patch. This is where the VMware Software Content Repository (SCR) tool comes into picture. SCR is a Java-based tool that is installed on a separate RHEL 7 VM. SCR downloads the patch signature files and OS vendor patch content from the content distribution network (CDN) and downloads subscription-only content from the OS vendor content websites.
Since the release of SCR 6.1, which was shipped with VCM 5.7.3, VMware supports the installation only on RHEL 7.x (refer to the VCM 7.5.3 release notes).