This adapter works fine, but turns out, I didn't need it!
My current laptop has only a VGA connector, which I hook up to an external monitor. I bought a used desktop computer because I wanted more RAM to run flight simulator, and a real video card. So, the computer I bought didn't have a VGA connecter, only a digital -- what is called a DVI-I connector. I googled the image of the plug.
I got a monitor recently, with a DVI cable, but the pin configuration looked different (it's called DVI-D) and because on the back of this used computer I bought, the power cable must be removed to even try to fit the plug in the back to the DVI socket, I thought it was two different kind of plugs. So, after reading up, I understood that DVI-I is dual analog/digital and this adapter worked fine to convert it to a VGA, but I didn't need to buy it!I could have just used the cable I had.
Anyway, what I'm saying, DVI-D cables do fit in the DVI-I socket fine. There's fewer pins, but they are completely compatible. Why this couldn't have been explained better in all the searches I did for this information is beyond me. Sites kept saying the separated pin grouping (DVI-D) was the "commercial version" as if that would mean something to the ordinary reader. I understand what it means now. It carries only the digital signal.
Anyway, it was very frustrating at the time, but monetarily, I wish all my mistakes cost $3 and were so tiny to store. Ha ha.