1. Download (20 MB, last update 2020.04.20).
  2. Unzip the downloaded file
  3. The option 'Unknown sources' should be enabled on your Android device (under Settings/Security). Then click/tap on the filename PyQRS-4.1-Android.apk; you will be asked whether you want to install the package.
  4. Confirm; the app does not need access to personal data or peripherals. In order to show Wikipedia pages and this web page, you will need a working internet connection.