I personally have this adapter to connect a desktop with a GTX 770's HDMI to an older VGA only monitor, and it works great: My sister called me about the same situation for her husband's laptop that ...
To detect a second monitor manually on Windows 10, use these steps: Open Settings. Click on System. Click the Detect button to connect to the external monitor under the "Multiple displays" section.
I have a laptop with an HDMI connector, and when I do presentations at work (a pretty common occurance) I have to plug into a projector w/ a VGA connection. I bought an adapter off Amazon, and it ...