If you have had any customization or development work done in your org, such as Salesforce processes, process steps or Apex code, then you must ensure that the upgrade will not affect or break these customization.
What should I do?
Consult your Salesforce administrator, integration partner or developer and check that they have read through the upgrade documentation and have understood that you will be removing some processes and scheduled jobs from your org.
You will be removing any Salesforce processes used to automatically refresh dial lists. For information about Salesforce processes, see Salesforce help. If you have steps in those processes that do work other than refreshing the dial lists, then you must.
If you had any Apex code or other customization that use the Connect package, then you must check that these still work after upgrading.
Make sure to apply best practices such as testing thoroughly in a full copy sandbox org before changing your production environment.
When you have made sure that you are safe to install, follow the instructions in any other section or sections that apply to your current installation and configuration.