To run two functions (od_MISOCP and od_AQUA) of the R package OptimalDesign, the Gurobi solver needs to be installed on your computer. For academics, the installation is simple, fast and free. Here we provide brief instructions for the users of the Windows operating system. Note: If you wish to use OptimalDesign and you encounter any problem, including a problem with the installation of the Gurobi package, do not hesitate to contact us at harman@fmph.uniba.sk or filova@fmph.uniba.sk. We will be glad to help you. 1. Go to https://www.gurobi.com/, create your personal academic account and log in. (Note: Gurobi will attempt to verify your academic IP address. This step needs to be done on a computer with an academic IP, but after the successful installation you do not need the internet connection at all to use the Gurobi solver.) 2. Create a free academic license of the Gurobi solver by following the instructions at: https://www.gurobi.com/academia/academic-program-and-licenses/ (Note: After downloading and running the "Gurobi optimizer" installation file, you may be asked to restart your computer.) 3. Install the R interface of Gurobi by following the instructions at: http://www.gurobi.com/documentation/8.1/quickstart_windows/r_installing_the_r_package.html (Note: A possible error while loading the Gurobi package is the following: "Error: package ‘slam’ required by ‘gurobi’ could not be found". In that case, run install.packages('slam') and try to load gurobi again.) 4. You can verify that your Gurobi installation is correctly installed by running the example at https://www.gurobi.com/documentation/8.1/quickstart_windows/r_example.html