How to install Waifu2x ncnn?

If you want to install apps from sources other than the Play Store, you’ll need to enable “Unknown Sources” on your Android device. Here’s how:

1. Open the Settings app on your device.

2. Tap Security or Applications (varies with device).

3. Select Unknown Sources to allow installation of apps from sources other than the Play Store.

4. When prompted, tap OK to confirm.

After that:

1. Tap the downloaded Waifu2x ncnn APK file.

2. Touch install.

3. Follow the steps on the screen.