I downloaded the stable version of forge, but I can't install it. When I try to open it, the computer will show a black window and disappear instantly. I have installed the latest version of java8. Some people say that there is a lack of Environment Variables. I fixed it as directed and passed the "java" test in cmd. However, the problem has not improved, and then I found that I also could not open the Light and Shadow Plugin installation package. The same problem, when you open the program with "java.exe", a black window will appear on the computer (just a flash) and then nothing will happen. Could somebody help me?(I am using win10 64)