If you've installed v25 in its own directory then the FEM Designer might not be in the right place anymore for Alibre v25 to see it. It may need an update from the FEM Designer developers, or just install v25 in the original standard c:\Program Files\Alibre Design\ folder and not the c:\Program Files\Alibre Design v25.0.0.25033\ that gets suggested at install time. That's what I've done until I update my own Addons to work with the new side-by-side installs.