How to have c++ 20 on windows?

  c++, execution, gcc9, mingw-w64, windows

I am working on windows 10 and currently have gcc8 installed on my system but the thing is #include <execution> cannot work with this version of gcc. So, I want to have gcc 9, but I have downloaded mingw 8 (the newest version) which probably have the latest gcc.

But this version of mingw does not have an installer. I copied on my driver but I am stuck the path I have to add to my system variables. since, there is no bin including lost of exes.
Can anyone help me with that?

Source: Windows Questions