If you want to install apps or .apk files from unknown sources outside of the PlayStore, we receive a security warning from the Huawei smartphone that you may endanger the system and this can be specified in the settings. Here you can allow third-party apps to be installed.

Android 10 (EMUI 10.0)
Step 1:  Open the  settings
Step 2:  Tap on  Security
Step 3:  Tap on  More settings
Step 4:  Tap on  Install apps from external sources
Step 5:  Choose an  App
Step 6:  Activate or deactivate  Allow app installs
  1. Open the settings
  2. Tap on Security
  3. Tap on More settings
  4. Tap on Install apps from external sources
  5. Choose an App
  6. Activate or deactivate Allow app installs

Huawei Instructions
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