Summary
You may get a message on your Apple Mac computer similar to the one pictured below, stating something like: “Legacy System Extension — Existing software on your system loaded a system extension signed by [company name] which will be incompatible with a future version of macOS. Contact the developer for support.” The example below is for Epson software.
Problem Resolution
Check for any available software updates:
- Software updates may be available under the File menu or Help menu.
- Some software will automatically check for updates.
- It’s also possible to download the latest version of the software.
Any of the above options should work. If the developer has provided a newer compatible version, this can help with compatibility and the notification may not show once the update is installed. Restart the computer to double-check.
Further Reading
Programs obtained through the Apple App Store will most likely be updated regularly for compatibility with the latest Apple operating system (macOS version).
Some companies offer software apps as downloadable through their own website rather than the Apple App Store. These companies may not have the budget and development team required to keep their software updated avoid being considered “Legacy” software. Presumably Apple has active inside-channel partners who are regularly kept informed of rollout schedules for operating system updates.
Pre-released versions of the operating system are made available so software developers can make sure their applications are fully compatible with upcoming releases of macOS. [Apple Developer Page | Apple Developer Program]
