Installation.md

@@ -93,13 +93,17 @@ The app is then accessible from a web browser (on the same machine the app was s
 
 ### Using RStudio
 
-1- [Download RStudio](https://www.rstudio.com/products/rstudio/download/#download).
-![RStudio_downloads](uploads/6f700f477992c17a9326068a129d40a8/RStudio_downloads.png)
- Install using your system installation procedure. If presented with options, choose default values.
+1- Make sure that Java and R are installed on your system (see [Requirements section](#requirements) above)
 
-2- Download the project's directory as a zip archive ([latest version](https://git.embl.de/heriche/image-data-explorer/-/archive/master/image-data-explorer-master.zip)) and unpack the archive.
+2- [Download RStudio](https://www.rstudio.com/products/rstudio/download/#download) for your system
 
-3- Start RStudio then:  
+![RStudio_downloads](uploads/f6b507a5450f257522cbdaef9c4dd0b8/RStudio_downloads.png)
+
+ Install using your system installation procedure (typically double-clicking on the downloaded file should do the trick). If presented with options, choose default values.
+
+3- Download the project's directory as a zip archive ([latest version](https://git.embl.de/heriche/image-data-explorer/-/archive/master/image-data-explorer-master.zip)) and unpack the archive.
+
+4- Start RStudio then:  
    1. navigate to the project's directory using RStudio's file browser.
    2. open the file image_data_explorer.R.  
        - if RStudio asks to install missing packages, reply yes. Note: this can take several minutes depending on how many of the package dependencies have already been installed.