valahaha At least as far as I have tried so far, our example project (SpineUE4.uproject
which is included in the spine-ue4 runtime directory) can be opened with UE 5.3.2 and the skeleton's animation can be played, although the asset name issue described above happens:

So installing the SpinePlugin into a UE 5.3 project itself should be possible.
Could you please start a new thread, as I asked you earlier, and explain in detail the steps you tried?