Installing and Updating Theme Press through the Universal Plugin Manager
Navigate to the Universal Plugin Manager.
Start in Confluence Administration. Locate the Atlassian Marketplace section in the sidebar and click on Find new apps. This takes you to Atlassian's Universal Plugin Manager. (Alternatively, you can click "Add-ons" under Confluence Administration, located in the gear menu of the Confluence Toolbar.)
In the search box, type Brikit Theme Press.
From the results, click the corresponding Buy Now or Free Trial button.