Don’t worry about that. I don’t think v4.15 is the issue here since these functionalities are working in the sample maps.
The enemies falling through the floor is probably some mismatch in the collision settings. If you’re using a custom mesh for your floor, it would be best if you make sure that the collision settings for it match the AI Path static meshes (you can find it under the collision settings in static mesh editor for SM_FoundationMesh) used in the sample maps.
If the Global Ability is not being deployed, then could you check if a breakpoint added at the node marked in the screenshot is being triggered? (when you try to deploy a global ability on a surface)
