Under the tab, check "Run this program in compatibility mode for" and select Windows XP (Service Pack 3) . Check "Run as Administrator" .
The vSphere 5.5 "Thick Client" is not officially supported on Windows 10, but it can usually be forced to work with these steps: vmware vsphere client 5.5 download windows 10 64 bit
Run a Windows 7 Professional VM inside VMware Workstation or VirtualBox, then install vSphere Client 5.5 there. This is the most reliable method for production environments. Under the tab, check "Run this program in
If you follow this guide step by step, you will have the running on Windows 10 64-bit within 20 minutes. Good luck, and long live the C# client. Under the tab