Download web installer from here: http://sourceforge.net/projects/mingw-w64/files/Toolchains%20targetting%20Win32/Personal%20Builds/mingw-builds/installer/mingw-w64-install.exe/download

mingw-w64 is an open source project and the developers provide source code only. If you're looking for Windows binaries then you need to download them from a third party who builds the source.

There are a few configurable options when building the source (such as threading backend and exception-handling backend) so you will see some differences amongst these builds. Here are some options:

• https://stackoverflow.com/questions/30069830/how-to-install-mingw-w64-and-msys2 -- this is the easiest way for installation with ongoing upgradability and support packages. Note that once it is installed you do not need to invoke msys2 to use the compiler , it is possible to just use msys2 for the package manager.
• https://stackoverflow.com/questions/38335424/how-to-use-mingw-64-with-qt-creator
• https://stackoverflow.com/questions/36972968/how-can-use-mingw-w64-and-msys2-with-any-ide-like-eclipse-or-codeblocks
• Official site . If you go here and follow the "mingw64-builds" link then here are some more relevant posts:
  • https://stackoverflow.com/questions/29947302/meaning-of-options-in-mingw-w64-installer
  • https://stackoverflow.com/questions/60210917/how-to-install-minwg64-non-of-the-approaches-work
• nuwen. This is actually mingw-w64 although the guy calls it "mingw" .
• TDM-GCC
• Equation - includes OpenMP

GCC 10 is officially released. The personal build for Windows (MinGW-w64) that can be downloaded from https://winlibs.com requires no installation, just extract to a folder.