If you are an existing customer, Apttus X-Author for Contracts 2.0 package is automatically upgraded to the latest release without any intervention (silent auto-upgrade). 

Apttus recommends to adopt the Centralized Deployment approach to access the X-Author for Contracts 2.0 add-in. This is a one-time activity for the administrator and users. If you are using the manifest file of X-Author for Contracts 2.0 version prior to Summer '20 release, the X-Author Contracts icon appears displayed in Microsoft Word. However, by clicking the X-Author Contracts icon you can access all features of X-Author for Contracts 2.0. With the Centralized Deployment approach, you can overcome this issue. For more information on Centralized Deployment, refer to Installing Production X-Author for Contracts 2.0.