If you want to install an app from an alternative app store, or anywhere but Google Play (or side-load something), you usually start by going to Settings > Security and scroll down to tick the box next to Unknown sources. However, you may also need to untick the Verify apps box. With the Moto G there have been a lot of people reporting that, even after doing that, when trying to install an app they get a parse error message.
Try This:
- If you upload the APK into Google Drive and then install from there on your Moto G then it should work.
- If your Moto G is rooted, you can use ES File Explorer. Go into the app Settings > App manager and tick install APK automatically and the app will handle it for you.
Solution:
- Make sure that all of your important data is backed up and factory reset the phone. You can do this via Settings > Backup & reset > factory Data Reset > Reset Phone. Now uncheck the security options when you are setting the device up again.