Just updated your copy of the macOS then found Iconographer Mini won't open any more (application is damaged and should be moved to the Trash), you need to download the update from https://ohanaware.com/iconographer/download.
One of the issues with macOS 15 is a change to how identifying certain hardware components works that affects Mac App Store issued applications. Apple generates a receipt file using the computers actual MAC address, but when trying to read the MAC address, we get a different value.
The solution came from an alternative method of read the MAC address, that was used to solve the open source project "Cyber Duck".
Apple have approved the update, you can download it using this link https://ohanaware.com/iconographer/download.