Frankly speaking, the last Filmpack standalone version I installed was v4.
However, in my install folder I found a set of FP presets, called 'DxO-FilmPack-4-Expert-Designer-presets-for-DxO-Optics-Pro'. I think, this was separately delivered DoP compatible collection, incl. 39 Presets. This is exactly same 39 pieces, are in the recent v11 FP5 preset folders.
Digging more deep into the issue, I installed the FP5 now. It is true, the FP5 Program Files folder doesn't include the Presets folder. FP5 save the user presets under the User data folder. Here is the .preset file content and placement comparison of the two apps ( see the enclosed 'Preset format.jpg ). These are far different, that is why it is not simple convertible. The only similarity is the file extension.
It is not an easy solution, but in FP5 the editing sliders are same as in DoP v11/DxO Filmpack Palette. One by one each parameter anyone can manually set in DoP, as it is in FP5 ( see the 'FP edit.jpg' ) and save as user preset in DoP.
Sorry again, to treat as a simple issue. It is not