How to Retrieve Final Cut Pro on Mac

Since she originally purchased it, if she has a friend with a current version she could ask them for a copy.

Your mom might also try contacting the AppleStore to see if there's a way to update her FCP with her old AppleID if she remembers the password. I don't know, just throwing out ideas.

Of course you can always keep using the FCP version that's on the machine. That should work until you upgrade the MacOS to a point where the FCP version won't run anymore. What FCP version is it? What MacOS version?

Just use the version you have. If it works you do not really need to update it unless there is some new feature you need specifically.

Alternatively use iMovie which is a very capable app.

Should you have really ambitious pro-editing ambitions get the FREE version of DaVinci Resolve.

DaVinci Resolve

If the app was purchased using your mother’s Apple ID, it is her software, and it is not transferable to you. The only way to access it from the App Store is using her Apple credentials.