Step 3: Even when you successfully install the older version of an app, it’s possible that the automatic update option in the Google Play Store will bump it to the latest version. To prevent this from happening, go to Google Play Store > Settings > Auto-update apps, and select the ‘Do not auto-update apps’ option.
Find My Device Find My Device makes it easy to locate, ring, or wipe your device from the web. Version your app | Android Developers Dec 27, 2019 How to find and install old versions of Android Apps
LG - Find the Android Version of LG Phone
If you're using it as your development platform, the SDK Manager is probably the easiest way to see what's available. To start the SDK Manager from within Android Studio, use the menu bar: Tools > Android > SDK Manager. This will provide not only the SDK version, but the versions of SDK Build Tools and SDK Platform Tools.
Nov 15, 2019 What is the Latest Android Version? And How to Update to Apr 06, 2020