Merge branch 'master' of https://github.com/hug-sch/portfolio-help

Author: hug-sch

docs/en/getting-started/installation.md

@@ -15,12 +15,28 @@ You can also download the Windows - Installer (setup.exe). On Windows 11, you ge
 
    + Windows: you can download the compressed Zip-file and extract it in a directory at your choice. Even an USB-stick (about 250 MB free space) is fine (run from stick). You can also download the installer file (setup.exe). On Windows 11, you get a security warning about the dangers to run a exe-file. Double clicking on this file, will start the installation. You need about 200 MB of free space.
 
+TODO: difference between windows installer & zip + adding how to install on macOS & Linux
 TODO: difference between windows installer & zip + adding how to install on macOS & Linux
 {: .hidden} 
 
 # MacOS
 
 
+# Github   
+The installer files are in fact stored in the [author's github repository](https://github.com/portfolio-performance/portfolio/releases). So, you can also download the program from this repository. If you ever should need a previous version, this is also the place to be (click on the version number at the left side).
+
+![Fig 3: Github repository for downloading (previous) releases](images/installation-download-github.svg)
+
+TODO: explain third box in figure 3, the meaning of asc extension, and question windows 32 bits or 64 bits?
+{: .hidden}
+
+You can edit and compile the source code; see [Contributing to Portfolio Performance](https://github.com/portfolio-performance/portfolio/blob/master/CONTRIBUTING.md#project-setup).
+
+# Updating the software
+After the first installation, the program will check on each start-up for new updates and install these automatically (see figure 1).
+
+![Fig 1: Automatic updating with newer version](images/installation-update.png)
+
 # Github   
 The installer files are in fact stored in the [author's github repository](https://github.com/portfolio-performance/portfolio/releases). So, you can also download the program from this repository. If you ever should need a previous version, this is also the place to be (click on the version number at the left side).