FIFA Manager 12 and 13 that will not work on the new rubbish EA App

I had the same issue and found a fix. I read on Reddit that deleting the license folder inside ProgramData can solve the problem, and after trying it myself, it worked.

To do this, you first need to make hidden files visible in Windows File Explorer, because the ProgramData folder is hidden by default. After turning on the option to show hidden items, go to this location: C:\ProgramData\Electronic Arts\EA Services\License.

In that folder you should see one or more files, such as 71067.dlf. Delete or move those files and the license problems with EA games should be resolved.

Hopefully this helps anyone else who is stuck with the same issue!