You haven't registered the App. If you have already entered your Registration Information/Serial Number and are getting this message, there is an error in the Registration Information you have entered. Please follow these steps: 1. Verify that you entered the correct License Type. Check that the License Type you entered matches the one in the email you received from us. 2. Verify that you entered the correct Purchaser's ID/Email Address. If you purchased online, enter the Email address used when the App was purchased. If you purchased a CD, use the Purchaser's ID that came with the App. 3. Verify that you entered the Registration Key/Serial Number correctly. Check for the following common problems: - typing the letter O or I instead of the number 0 or 1 - transposing 2 digits - adding extra spaces before or after the Purchaser's ID or Serial Number - entering the registration information more than once (click in the field and scroll with the arrow keys to see this) - entering the registration information for the wrong App. If that didn't solve the problem, delete your preferences file and configure ShredIt X again. The preferences file's location is: "$HOME/Library/Preferences/com.mireth.shreditx.plist" If that didn't solve the problem, contact Support at support@mireth.com