ive done everything right, and yet i am still getting "app not installed as package appears to be invalid". Nothing i do seems to fix anything

okay, this is what you have to do if what u want is to download an update if u use android, when you press the install button, activate and deactivate several times while... The wifi Button and...

The app is being installed, what's happening? Well, it's a bug, but it can work to force the installation.