Hi! I understand how frustrating it can be when you're unable to update your Dunkin' app due to compatibility issues. Let's see if we can resolve this together.

1. Check OS Compatibility: The first thing is to ensure that your device meets the app's minimum OS requirements. Since you’re using OS X 10.15.7, it’s important to check if the latest version of the Dunkin' app supports that version. Many apps are gradually phasing out support for older versions.

2. Free Up Space: Make sure your device has enough storage space. Sometimes, updates can't be installed if there's not enough free space available.

3. Update Your Device: Are there any pending updates for your Mac? Sometimes updating your OS can help in making apps compatible.

4. Reinstall the App: If the above steps don’t resolve the issue, you can try uninstalling the Dunkin' app and then reinstalling it from the Mac App Store. This can sometimes fix manifest problems.

5. Check for Known Issues: I found some discussions where users have reported similar compatibility issues. This might indicate that newer app versions are not supporting older OSes as of early January 2025. If your device is older, that might be the root cause1.

If you've attempted these steps or if there's more detail you can provide about any error messages or issues, please let me know, and we can continue troubleshooting! Are you satisfied with the solution I provided?