# Software Installation Guide

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## Software Installation Guide

Make a note of the name and location of the downloaded file.

Your next step is to double-click on the Gurobi installer that you downloaded from our website (e.g., Gurobi-8.1.1-win64.msi for the 64-bit version of Gurobi 8.1.1).

By default, the installer will place the Gurobi 8.1.1 files in directory c:\gurobi811\win64 (or c:\gurobi811\win32 for 32-bit Windows installs). The installer gives you the option to change the installation target. We'll refer to the installation directory as <installdir>.

Command-Line Installation

You can also install Gurobi using the command-line interface to the Windows Installer. Open a cmd prompt, use cd to go to the directory that contains the Gurobi installer image, and enter the following command:

msiexec /i Gurobi-8.1.1-win64.msi /norestart

If you are unfamiliar with running command-line commands on a Windows system, you can learn more here.

Installing 32-bit and 64-bit simultaneously

You should normally only install the Gurobi version that is targeted to your platform (32-bit or 64-bit Windows). If you want to install both on the same machine, note that the Gurobi installer sets Windows environment variables that will point to one particular version. This can cause confusion, particularly when a program asks Windows to load the Gurobi DLL. If you understand the implications, feel free to install both.

To work with compressed files within the Gurobi Optimizer, we recommend that you install gzip (www.gzip.org) and/or 7zip (www.7-zip.org).