I thought I would do a quick post as I come across this frequently. Windows 2016 has flash player available, but it is not enabled by default. Especially frustrating as many of the vmware consoles I use are still flash based.
There are security concerns around installing flash player on a server, so I tend to limit this to lab environments, but it is a good to know.
The video illustrates the straightforward process
If you are just after the command it is as below:
dism /online /add-package /packagepath:"C:\Windows\servicing\Packages\Adobe-Flash-For-Windows-Package~31bf3856ad364e35~amd64~~10.0.14393.0.mum"