Installers are up

you can get them via the old link.
Some stuff to notice.
the installer will give you the option of installing the drmingw JIT debugger as the default JIT debugger,
in case you use msvc also be sure that you want this as all crashes will be redirected to drmingw if you choose yes.
I included a few tools that might be nice to have as a game dev, like gimp which is a pretty powerfull image editor.
You can now update mingw packages with pacman so if the msys2 site has something you need feel free to get it with pacman -S < package you want > (without the <>).
Only restriction to the above is QT as the msys2 QT versions are located directly in the mingwdir while mine is located in mingwdir/local,
i found that a bit messy so decided to put mine in its own dir under mingw.
Gcc itself uses the msys2 patchset besides my own that are based on the TDM patchset, the TDM patchset makes gcc able to throw exceptions from statically linked libraries and it defaults to linking statically with gcc libs,as well as linking statically with pthreads when using c++11 or openmp. In a few edge cases you might get that a program built with this, that will still depend on the shared libstdc++ library,
in that case its because the program would not work correctly when linked statically but its rare

.
The Msys2 patchset is also noteworthy as it fixes a pretty large portion of gcc for windows, example gcc uses hardcoded paths to search for system libraries and that path allways points to /mingw which is wrong if
you use mingw64, so before starting a gcc bootstrap it patches in the real path to /mingw /mingw64/x86_64-w64-mingw32 or /mingw32/i686-w64-mingw32 so that gcc knows exactly where system libraries
are located. It also patches the compiler to take note of devs using CPPFLAGS to set non standard paths.
Productivity is a state of mind.