If you (or your team) created the app using the command line tools then the URL looks like this:
where <name> is your app's shortname that you gave when you created the app.
You can also do a "jiveapps list" to see all a list of the apps that you created.
Once you have the url paste it into the text field in the Developer App Installer and make sure there is no space character(s) before or after the url (yeah, I know, we should trim before trying to validate the URL, we will take care of it).
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