We have confirmed that the Monster Hunter Now app cannot be downloaded or updated successfully if your device is not supported, or, there are other Niantic apps(Pokémon GO, Pikmin Bloom, etc) on the same device that were downloaded from and installed using a method other than downloading from Google Play Store or Galaxy Store.
Using modified or unofficial software is prohibited by the Niantic Terms of Service and Niantic Player Guidelines and violations will result in a warning, suspension of your account, a diminished gameplay experience, or permanent suspension of your account without warning.
For Supported devices, please see this FAQ.
If you are not aware of any such violations, please provide us with your information from this form.