If you are new to MinGW, see the MinGW Getting Started  instructions to use the automated GUI or manual CLI (Command Line Interface) installers. What follows below are instructions for a very "manual" download, typically only attempted by more experienced users.
Before you start this manual installation, read the release notes  (at the bottom of the page).
- Determine which files below you need and download them.
- Extract the files into a directory such as C:\MinGW
- Add C:\MinGW\bin; to the PATH environment variable.
You will need a program that can extract .tar.lzma files, such as 7-Zip  or one that provides command-line tar and lzma tools. A basic standalone tar program that includes lzma support is available from the MinGW project and is called bsdtar .
You must add C:\MinGW\bin; to your user PATH environment variable manually. You can permanently add C:\MinGW\bin; to your PATH by following the instructions in the "Environment Settings" section on the MinGW Getting Started  page.
The resulting C:\MinGW subtree is fully relocatable which means that you can have multiple installations or versions of the MinGW suite. You can potentially have installations such as:
C:\MinGW-3.4.5 C:\MinGW-4.8.1 etc.
Switching between these is merely a matter of renaming any particular directory to C:\MinGW.
Files To Get
Download at least the following (or newer) packages from the MinGW Download Page. Where two or more component packages are indicated, you need both / all of them.
- binutils (bin  and dev )
- mingw-runtime (dev  and dll )
- w32api 
- Required runtime libraries for GCC:
- gcc-core (bin  and dev  and dll )
The above are the minimum requirements for a working C Language compiler using the MinGW GCC toolchain.
You can also add one or more of the following optional compilers or tools. For each you choose to install, you need all three of the bin, the dev and the dll component packages:
- gcc-c++ (bin  and dev  and dll ) for C++
- gcc-objc (bin  and dev  and dll ) for Objective C
- gcc-fortran (bin  and dev  and dll ) for Fortran 90/95
- gcc-java (not yet available) for Java
- gcc-ada (bin  and dev  and dll ) for Ada
Note that the GCC versions of these files must match the GCC version of the gcc-core installed.
You can also add the following additional utilities:
- mingw-gdb  and libexpat  for debugger
- mingw32-make  for make
- mingw-utils  for MinGW Utilities
- msysDTK  for Unix-style developer toolkit
- MSYS  for Unix-style commands and shell. (See the MSYS  page for installation instructions.)
You may also want the following features:
- translations of gcc , binutils , gdb , and make  messages into languages other than English
- documentation for gcc-core , gcc-c++ , and gcc-fortran 
Getting Updates or Making Changes
Updating a single package (e.g. when there is a new version of w32api) can be done by extracting the new version to C:\MinGW to overwrite the older version. This manual update also works with an initial automated install.