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[jacque]

Also note that you can test in the Android emulator by creating a VM with ARM support.The emulator you made for Nexus 5 may not have been created for ARM, so check that. If it isn't ARM then create a new emulator and specify ARM.

For your real S8 device, a common cause for refusal to install is that you have not assigned a signing key. In the Android pane of Standalone Settings, look for the "Signing" popdown and choose "Sign for development only". That will allow Android to launch your app. Later you can create your own signing key if you plan to distribute the app.

Another reason for failure to install is if you have an existing copy on the device and you try to install a new copy with the same build number. You can either change the "Version Code" in standalone settings, or delete the current app on the phone before installing the updated one.