The vSphere Client 6.0 is the final version of the legacy "thick" or "FAT" Windows client for managing ESXi and vCenter. Following this version, VMware transitioned entirely to the HTML5-based Web Client [33]. Direct Download Links
Note: Access to legacy software downloads may be restricted based on the user's license entitlement and account status. vsphere client 6.0 download link
Note: You must have a valid entitlement (license) associated with your account to access these legacy downloads. The vSphere Client 6
ESXi Host Web Page: Open a web browser and enter the IP address of your ESXi 6.0 host. The "Getting Started" page often contains a link to "Download vSphere Client". Note: You must have a valid entitlement (license)
Although VMware vSphere 6.0 reached its End of General Support (EOGS) on March 12, 2020, many legacy environments still rely on this version for specific hardware compatibility or legacy application support. For administrators taking over an older environment or performing disaster recovery, finding the correct download link for the vSphere Client (C# Client) can be difficult, as the location has moved over the years.
Since the standalone Windows "thick client" is legacy software, here are the standard ways to obtain or access it: ESXi Host Integrated Installer
Official Download Link