Log in to your Confluence instance as an administrator.
Select the user icon.
From the dropdown menu which appears, choose Atlassian Marketplace. The 'Find new apps'screen will be displayed.
Use the search function to locate 'Duplicate Page Title for Confluence'. The correct app version will be shown in the search results.
To start a new trial version, click 'Try free' and to purchase a license for Duplicate Page Title for Confluence click 'Buy now'. You will be asked to log in to MyAtlassian. The Duplicate Page Title for Confluence app starts downloading.
After entering your data on MyAtlassian, click on 'Generate license'.
Continue by clicking 'Apply license'. If you're using an older version of UPM, you can copy and paste the license into your Jira instance.