Based on community contributions and archival sources, the following are known working download links for vSphere Client 6.0 variants. Please note that these links may not be officially maintained and availability cannot be guaranteed indefinitely.
Because the desktop client (C# Client) is deprecated and limited to vSphere 6.0, you should transition to the built-in web management interfaces whenever possible. vsphere client 6.0 download link
vCenter 6.0 uses an older Adobe Flash-based web client. Because Adobe Flash Player is deprecated and blocked by modern browsers, using this client requires complex browser workarounds. Based on community contributions and archival sources, the
Choose and locate the vSphere Client for Windows binary. vSphere Client 6.0 Build Numbers and Versions vCenter 6
The easiest and safest way to get the vSphere Client 6.0 is to download it directly from your active ESXi host. VMware built the client installer directly into the host's web server. Open your web browser.