# Installation manual for RStudio and litteR

#### Dennis Walvoort Wageningen Environmental Research, The Netherlands
Willem van Loon Rijkswaterstaat, The Netherlands

#### 2025-09-28

# 1 Introduction

The litteR-package requires a recent installation of the R-environment (R version 4.5.1 (2025-06-13) or later). In addition, MS-Windows users also need to install RStudio, an integrated development environment (IDE) for R.

The aim of this manual is to help people with no, or only a limited experience with R and RStudio to

1. install the R-environment;
2. install RStudio;
3. install and update the litteR-package (and its dependencies).

Although this manual primarily focuses on MS-Windows users, users of other operating systems may also find these instructions useful.

# 2 Installation of R

The latest version of R can be downloaded from the Comprehensive R Archive Network (CRAN) website as follows:

1. Navigate in a web-browser to https://cran.r-project.org;
2. Select the R-version for your operating system, e.g., `Download R for Windows`;
3. Select ‘base’;
4. Select `Download R x.y.z` (where x.y.z. is the version number, e.g., 4.5.1);
5. Double click on the downloaded file and follow the installation instructions on the screen. In case of doubt, simply select the default/recommended settings.

# 3 Installation of RStudio

The latest version of RStudio can be downloaded from the RStudio website: https://posit.co/:

1. Click the download RStudio button;
2. Click the download RStudio Desktop button;
3. Click on the link ‘RStudio x.y.z - Windows 10/8/7 (64-bit)’ to download the MS-Windows version of RStudio (or click another link that matches your operating system). Again, x.y.z. is the version number;
4. Double click on the downloaded file and follow the installation instructions on the screen. In case of doubt, simply select the default/recommended settings.

# 4 Installation of litteR

The easiest way to install litteR is by means of the package manager of RStudio. The package manager is located at the lower right panel of RStudio. The installation instructions are as follows:

1. click on the `Packages` tab in the lower right panel;
2. click on the `Install` button on the upper left of this tab (see figure below);
3. The `Install Packages dialogue` will appear (see below). Type litteR in the `Packages` text box (see below);
4. click the `Install` button. RStudio will now install litteR and all its dependencies.

# 5 Updating litteR

We will occasionally publish new versions of litteR on CRAN. The easiest way to update litteR is by means of the package manager of RStudio. Simply click the `Update` button of the `Packages` tab and RStudio will update all outdated packages.

Location of the Update button

# 6 Using litteR

For using litteR in your projects, please consult our user manual.