If an app isn't working as you expect
After you upgrade macOS, you might find that some third-party apps don't work or act as you expect. An app might not open, run, or install, even if you try to reinstall it.
You might see this issue if:
- Your Mac has software installed on it that's known to be incompatible with your new macOS version. This software is placed in an Incompatible Software folder during the upgrade process.
- Your Mac has software installed on it that conflicts with updates to System Integrity Protection in macOS High Sierra.
Make sure that you have the latest version
If an app doesn’t work after you upgrade, make sure that you have the latest version:
- Check for an updated version of the app that is compatible with your new OS. Apps in the Mac App Store list their compatibility and system requirements on their product pages.
- Find out whether the app developer has a new version or plans to release a new version of the app that is compatible with your new OS.