If you get an error message with Error Code 1015 on JPEGmini Pro start, please try resetting the app configuration.
Note: this will reset your activation and existing settings. Ensure to have your activation code before proceeding with the steps below.
Open File Explorer
Copy and paste the following into the address bar: %AppData%
Press Enter
In the directory that opens, locate and delete the folder named JPEGminiPro
Restart JPEGmini Pro
If it runs normally, activate it with your activation code
If that doesn't help, contact us at support@jpegmini.com