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• Open the Google Play Store
• Search for “X-plore File manaer”. You should be able to just type in “X” in search and it will be among the top results.
• Install X-plore File Manager
• Open X-plore File manager from the Play Store page or the app launcher screen.
• Say “Allow” when asked if X-plore should have access to local files.
• Press the right arrow until you have highlighted the right-side column, then press down to select “WiFi file sharing”. “WiFi” is just part of the name for this option, you will still use this option even if using a wired ethernet connection.
• Navigate down to “WiFi server”
• Select “Start”
• Write down the web address that it shows under “WiFi file sharing”
• On a desktop computer, download the APK to install on that computer
• Open a new browser window and enter the web address from step 9.
• You will see a grid of icons that say things like “Android” and “Alarm”, and above those will be a smaller row of icons, including one that is a blue up arrow. The blue up arrow is an “upload” button. Click on the upload button (the blue up arrow).
• This will show you a window with files on your computer. Navigate to the APK file from step 10 and select it. This will upload the APK file.
• Back in the X-plore app, navigate to the “Internal shared storage” option. You can do this on either of the two columns, it doesn't matter which one.
• Scroll down until you find the APK file you uploaded from your PC and select it.
• A screen will open asking you to grant X-plore the ability to install “unknown apps”. Select the “Settings” button on this screen.
• Select the “X-plore” option, which will turn the “switch” icon blue.
• Press the back button on your remote to go back to X-plore.
• Select the APK you uploaded from your computer a second time.
• Select the “Install” button.

You're done.