How do I install Android 6.0 Marshmallow stock apps?
Installing your apps is very easy. It is likely that you will only need to learn to do this one time.
Step 1: Download the files for the apps you want.
Step 2: Go to Settings and open the “security” menu. There, you should find a box labeled “only run known sources”. You should make sure this box is unchecked. It is checked by default.
Step 3: Go to the “Files” app and open your downloads folder. Locate the file for the app you want to use. Tap on the file and follow the set up guide.
Step 4: If your app does not open, try uninstalling the old version of the app. This can by finding the app under Settings > Applications and tapping uninstall.
Step 5: If the app still does not open, try contacting a customer service representative in your area.