What Akila suggested above is a good practice to ensure that you have a copy readily available for a back up in case you need it and make sure you turn on the previous models option to have access to all of the older models.
In regards to the wifi connection, the auth file that is created when you login to the app is stored and keeps the app working in the fully licensed mode for awhile, however it will expire after 90 days. Once that happens a user will just need to log back in to create a new auth file.
