Vsphere Client 5.5 //free\\ Download For Windows 11 -

100% stable, no tweaking ESXi security. Cons: Requires extra RAM/CPU and VM management.

While the desktop client (C#) was the standard for 5.5, the Web Client is often more compatible with modern browsers (though it still requires Flash or an HTML5 fallback). vsphere client 5.5 download for windows 11

Rather than "breaking" the security of your Windows 11 host to support a 10-year-old application, the industry standard practice is to 100% stable, no tweaking ESXi security