Installation process is standard for any Atlassian Confluence plugin:

  1. Login to Confluence instance as an administrator.
  2. From admin dropdown list choose Atlassian Marketplace.
  3. Click Find new add-ons link on the left-hand side of the page.
  4. Locate CelesteCS Image Lossless Rotator via search.
  5. Choose Try free to just evaluate or Buy now to buy a license for the plugin.
  6. Enter requested information and click Generate license after being redirected to MyAtlassian.
  7. Click Apply license.