update installation instructions

Pages/Installation-Instructions.md

@@ -31,10 +31,13 @@ Please read the following instructions carefully to prepare for the workshop. Co
 
 1. Install Miniconda by following the installation instructions for your operating system at [this page](https://docs.anaconda.com/free/miniconda/miniconda-install/)
 2. Please check that the installation worked properly by opening the Terminal (MacOS) or Anaconda Prompt (Windows) and typing `conda list`. If conda has been installed correctly, a list of installed packages appears.
-3. (Optional) Switch to the faster `libmamba` solver, by updating conda and then installing and activating the solver. Do so by typing the following command in the Terminal/Anaconda Prompt one at a time and pressing Enter after each one:
 
-   ```
-   conda update -n base conda
-   conda install -n base conda-libmamba-solver
-   conda config --set solver libmamba
-   ```
+FAQ: "What should I do if I already have `conda` installed on my machine?"
+Please make sure that your `conda` installation is up to date. To do so, run the following command:
+```
+conda --version
+```
+If this returns a version older than `23.10.0`, please update your `conda` by running
+```
+conda update -n base conda
+```