I bought the Gold package a couple of years ago, but when I install it today in Studio One, it won’t work. Do I have to buy gold again? I see that it says Nov 27, 2016 on Update plan. I have made a USB Activated to Key.
Have a look here to make sure your version of Waves is supported for your current DAW and OS version. Issues can often arrive here.
Short of that you can check out their FAQ section or contact Tech Support themselves.