Sideloading is the term used for installing apps to your Android mobile phone without going through the Google Play Store. Therefore, the apps are installed by directly downloading the APK (Android Package Kit) file to your phone. The APK file is the installation file which is needed in order for app to be successfully installed on an Android device.
Android Oreo now has a safer way to allow sideloading. Instead of changing only one setting to allow programs from unknown sources, you have more control over which apps are allowing this option. This new way of sideloading will enable you to install new apps while keeping the rest of the system secure.
NOTE: Make sure the apps you are loading come from trusted sources like APKMirror and APKPure only.
If your Android phone is running Android Oreo and want to sideload apps onto it, just follow the instructions below:
Sideloading Apps in Android Oreo
STEP 1: Swipe down from the top to expand the menu, then locate the Settings gear in the upper-right corner, and then tap on it.
STEP 2: Go to Apps & Notifications, and then tap on the Advanced menu.
STEP 3: Next, select Special App Access.
STEP 4: Select Install unknown apps.
NOTE: You will then see a list of apps that are capable of downloading APK files. Notice that by default none of these appsare allowed to download.
STEP 5: Click on the one you want to use to download apps, and then toggle the switch next to Trust apps from this source to its on setting.
NOTE: When you go back to the previous menu, the word “yes” now appears under that app you have just enabled. This indicates that the program is allowed to download apps from places other than the Google Play Store.