Install vSphere 4 client on Windows 10

I ran into a number of errors attempting to install an older vSphere client in Windows 10. The first error says "This product can only be installed on Windows XP SP2 and above".  This issue is described in this VMware KB article.  I fixed this by right-clicking the installer executable and selecting to run it in Windows XP SP3 compatibility mode.  After that the installer seemed to run but would ultimately silently fail without installing anything.  It turns out that the installer requires .NET 3.5 to be installed.  These instructions from Microsoft show how to install this prerequisite in Windows 10, and it did not require a reboot for me.  Once vSphere 4 was installed I was able to successfully run it as well as update to later version when connecting to vCenter servers on newer ESXi.