The install button for the app is not working.

There are two possible causes.

The first is that the application has not been configured and is still in its default settings.
In this case, please configure the settings from the administration screen.

The second is when the app is not loaded sufficiently.
If the problem occurs after setting up the application, this may be the cause.
In this case, reloading and restarting the application will improve the problem.