I need GCC 4.7, so how can I downgrade the installation, or reinstall MinGW with that version? The command below returns the highlighted error, besides the "probable package conflict" reported in the other thread. I tried some varieties but none works.

$ mingw-get install --reinstall gcc='4.7.*'
mingw-get.exe: *** ERROR *** there is no release matching gcc=4.7.*
mingw-get.exe: *** ERROR *** available candidate releases are...
mingw-get.exe: *** ERROR ***  gcc-core-4.8.1-4-mingw32-man.tar.lzma
mingw-get.exe: *** ERROR ***  gcc-core-4.8.1-3-mingw32-man.tar.lzma
mingw-get.exe: *** ERROR ***  gcc-core-4.8.1-2-mingw32-man.tar.lzma
mingw-get.exe: *** ERROR ***  gcc-core-4.8.1-1-mingw32-man.tar.lzma
mingw-get.exe: *** ERROR *** there is no release matching gcc=4.7.*
mingw-get.exe: *** ERROR *** available candidate releases are...
mingw-get.exe: *** ERROR ***  gcc-core-4.8.1-4-mingw32-info.tar.lzma
mingw-get.exe: *** ERROR ***  gcc-core-4.8.1-3-mingw32-info.tar.lzma
mingw-get.exe: *** ERROR ***  gcc-core-4.8.1-2-mingw32-info.tar.lzma
mingw-get.exe: *** ERROR ***  gcc-core-4.8.1-1-mingw32-info.tar.lzma

reinstall: gcc-core-4.8.1-4-mingw32-lic.tar.lzma
 removing release gcc-core-4.8.1-4-mingw32-lic.tar.lzma
 installing gcc-core-4.8.1-4-mingw32-lic.tar.lzma
reinstall: libpthread-2.9.1-1-mingw32-dll-2.tar
 removing release libpthread-2.9.1-1-mingw32-dll-2.tar
 installing libpthread-2.9.1-1-mingw32-dll-2.tar
reinstall: libgcc-4.8.1-4-mingw32-dll-1.tar
 removing release libgcc-4.8.1-4-mingw32-dll-1.tar
 installing libgcc-4.8.1-4-mingw32-dll-1.tar
reinstall: gcc-core-4.8.1-4-mingw32-dev.tar.lzma
 removing release gcc-core-4.8.1-4-mingw32-dev.tar.lzma
 installing gcc-core-4.8.1-4-mingw32-dev.tar.lzma
reinstall: gcc-core-4.8.1-4-mingw32-bin.tar.lzma
 removing release gcc-core-4.8.1-4-mingw32-bin.tar.lzma
 installing gcc-core-4.8.1-4-mingw32-bin.tar.lzma
reinstall: gcc-4.7.2-1-mingw32-doc.tar.lzma
 installing gcc-4.7.2-1-mingw32-doc.tar.lzma
mingw-get.exe: *** ERROR *** C:\Programs\Desenvolvimento\MinGW\/share/doc/gcc/4.7.2/MAINTAINERS: extraction failed
mingw-get.exe: *** ERROR *** C:\Programs\Desenvolvimento\MinGW\/share/doc/gcc/4.7.2/MAINTAINERS: probable package conflict; existing file not overwritten
mingw-get.exe: *** ERROR *** C:\Programs\Desenvolvimento\MinGW\/share/doc/gcc/4.7.2/README: extraction failed
mingw-get.exe: *** ERROR *** C:\Programs\Desenvolvimento\MinGW\/share/doc/gcc/4.7.2/README: probable package conflict; existing file not overwritten

mingw-get.exe: *** ERROR *** C:\Programs\Desenvolvimento\MinGW\/share/man/man1/cpp.1: extraction failed
mingw-get.exe: *** ERROR *** C:\Programs\Desenvolvimento\MinGW\/share/man/man1/cpp.1: probable package conflict; existing file not overwritten
mingw-get.exe: *** ERROR *** C:\Programs\Desenvolvimento\MinGW\/share/man/man1/g++.1: extraction failed
mingw-get.exe: *** ERROR *** C:\Programs\Desenvolvimento\MinGW\/share/man/man1/g++.1: probable package conflict; existing file not overwritten
mingw-get.exe: *** ERROR *** C:\Programs\Desenvolvimento\MinGW\/share/man/man1/gcc.1: extraction failed
mingw-get.exe: *** ERROR *** C:\Programs\Desenvolvimento\MinGW\/share/man/man1/gcc.1: probable package conflict; existing file not overwritten
mingw-get.exe: *** ERROR *** C:\Programs\Desenvolvimento\MinGW\/share/man/man1/gcov.1: extraction failed
mingw-get.exe: *** ERROR *** C:\Programs\Desenvolvimento\MinGW\/share/man/man1/gcov.1: probable package conflict; existing file not overwritten
mingw-get.exe: *** ERROR *** C:\Programs\Desenvolvimento\MinGW\/share/man/man1/gfortran.1: extraction failed
mingw-get.exe: *** ERROR *** C:\Programs\Desenvolvimento\MinGW\/share/man/man1/gfortran.1: probable package conflict; existing file not overwritten
mingw-get.exe: *** ERROR *** C:\Programs\Desenvolvimento\MinGW\/share/man/man7/fsf-funding.7: extraction failed
mingw-get.exe: *** ERROR *** C:\Programs\Desenvolvimento\MinGW\/share/man/man7/fsf-funding.7: probable package conflict; existing file not overwritten
mingw-get.exe: *** ERROR *** C:\Programs\Desenvolvimento\MinGW\/share/man/man7/gfdl.7: extraction failed
mingw-get.exe: *** ERROR *** C:\Programs\Desenvolvimento\MinGW\/share/man/man7/gfdl.7: probable package conflict; existing file not overwritten
mingw-get.exe: *** ERROR *** C:\Programs\Desenvolvimento\MinGW\/share/man/man7/gpl.7: extraction failed
mingw-get.exe: *** ERROR *** C:\Programs\Desenvolvimento\MinGW\/share/man/man7/gpl.7: probable package conflict; existing file not overwritten
mingw-get.exe: *** ERROR *** C:\Programs\Desenvolvimento\MinGW\/share/info/cpp.info: extraction failed
mingw-get.exe: *** ERROR *** C:\Programs\Desenvolvimento\MinGW\/share/info/cpp.info: probable package conflict; existing file not overwritten
mingw-get.exe: *** ERROR *** C:\Programs\Desenvolvimento\MinGW\/share/info/cppinternals.info: extraction failed
mingw-get.exe: *** ERROR *** C:\Programs\Desenvolvimento\MinGW\/share/info/cppinternals.info: probable package conflict; existing file not overwritten
mingw-get.exe: *** ERROR *** C:\Programs\Desenvolvimento\MinGW\/share/info/gcc.info: extraction failed
mingw-get.exe: *** ERROR *** C:\Programs\Desenvolvimento\MinGW\/share/info/gcc.info: probable package conflict; existing file not overwritten
mingw-get.exe: *** ERROR *** C:\Programs\Desenvolvimento\MinGW\/share/info/gccinstall.info: extraction failed
mingw-get.exe: *** ERROR *** C:\Programs\Desenvolvimento\MinGW\/share/info/gccinstall.info: probable package conflict; existing file not overwritten
mingw-get.exe: *** ERROR *** C:\Programs\Desenvolvimento\MinGW\/share/info/gccint.info: extraction failed
mingw-get.exe: *** ERROR *** C:\Programs\Desenvolvimento\MinGW\/share/info/gccint.info: probable package conflict; existing file not overwritten
mingw-get.exe: *** ERROR *** C:\Programs\Desenvolvimento\MinGW\/share/info/gfortran.info: extraction failed
mingw-get.exe: *** ERROR *** C:\Programs\Desenvolvimento\MinGW\/share/info/gfortran.info: probable package conflict; existing file not overwritten
mingw-get.exe: *** ERROR *** C:\Programs\Desenvolvimento\MinGW\/share/info/gnat-style.info: extraction failed
mingw-get.exe: *** ERROR *** C:\Programs\Desenvolvimento\MinGW\/share/info/gnat-style.info: probable package conflict; existing file not overwritten
mingw-get.exe: *** ERROR *** C:\Programs\Desenvolvimento\MinGW\/share/info/gnat_rm.info: extraction failed
mingw-get.exe: *** ERROR *** C:\Programs\Desenvolvimento\MinGW\/share/info/gnat_rm.info: probable package conflict; existing file not overwritten
mingw-get.exe: *** ERROR *** C:\Programs\Desenvolvimento\MinGW\/share/info/gnat_ugn.info: extraction failed
mingw-get.exe: *** ERROR *** C:\Programs\Desenvolvimento\MinGW\/share/info/gnat_ugn.info: probable package conflict; existing file not overwritten
mingw-get.exe: *** ERROR *** C:\Programs\Desenvolvimento\MinGW\/share/info/libgomp.info: extraction failed
mingw-get.exe: *** ERROR *** C:\Programs\Desenvolvimento\MinGW\/share/info/libgomp.info: probable package conflict; existing file not overwritten
mingw-get.exe: *** ERROR *** C:\Programs\Desenvolvimento\MinGW\/share/info/libquadmath.info: extraction failed
mingw-get.exe: *** ERROR *** C:\Programs\Desenvolvimento\MinGW\/share/info/libquadmath.info: probable package conflict; existing file not overwritten
mingw-get.exe: *** ERROR *** C:\Programs\Desenvolvimento\MinGW\/share/doc/MinGW/gcc-4.7.2-1-mingw32.RELEASE_NOTES.txt: extraction failed
mingw-get.exe: *** ERROR *** C:\Programs\Desenvolvimento\MinGW\/share/doc/MinGW/gcc-4.7.2-1-mingw32.RELEASE_NOTES.txt: probable package conflict; existing file not overwritten

reinstall: gcc-4.7.2-1-mingw32-lang.tar.lzma
 removing release gcc-4.7.2-1-mingw32-lang.tar.lzma
 installing gcc-4.7.2-1-mingw32-lang.tar.lzma