Android app download
As part of the Android operating system, there is a restriction that
blocks installing applications outside the Google Play Store.
You can download the file here, then follow the instructions below

Instructions
If you have previously downloaded our app here, please uninstall and download again - this is a new version.
If it's your first time installing an App outside of the Play store, you
will be greeted with an install blocked message.
For security, your phone is set to block installation of applications
not obtained from Play Store.
If you have a phone running
Android Oreo or higher, you will be shown a dialog asking you to give
permission to the installation.
If the app does not install you will
first need to grant permission by following these steps:
- 1. Navigate to Setting > Security.
- 2. Check the option "Unknown sources".
- 3. Tap OK on the prompt message.
- 4. Select "Trust".
That's all, now you can try again to install the Application. Note that this settings will be stored permanently into your operating system and you will be able to install Android Apps from ALL sources, not only from Running World Cup. You're still protected Even when installing Apps from Unknown sources, Google Play Protect will continue scanning Apps, looking for viruses, malware and blocking forbidden Apps.