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