Following are the steps to be followed for upgrading the applications –
1. No need to uninstall existing version
2. Go to AppExchange and click “Get It Now” and follow the instructions
3. On rare occasions we deprecate existing fields and objects and replace it with new ones. So you may have to update page layouts and list views.
Grant us login access so we can confirm the configuration.
Please check the video about granting access in your Org.