DiskCatalogMaker is shareware. You can try the software for free for 30 days. Please evaluate it before you buy it.
If you have purchased the wrong item, please send a refund request to support@diskcatalogmaker.com within 14 days. It will take some time to process it and revoke the license number.
If you have purchased it via Mac App Store, please send a refund request to Apple. You can contact Apple by going to the following link: http://reportaproblem.apple.com/ (There, sign in with your Apple ID, and click “Report a Problem” next to the purchase you want a refund for. Please be specific about why you request the refund.)