Download and install of the VMware Skyline Health Diagnostics using the ISO install media file has been deprecated starting from version 4.0 onwards.
Attention:
Follow the Migrate the Existing VMware Skyline Health Diagnostics Instance to Version 4.0.0 to upgrade ISO based installs to the VMware Skyline Health Diagnostics version 4.0.0.
Post migrated to Version 4.0.0, you can use the Offline Path Bundle for future update/patching of the VMware Skyline Health Diagnostics (Refer: Downloading update packages for Offline Update)