You can't use presets from VC4 applications in VC5 applcations.
To use Ambient Soundscapes Expansion You need to have your old Matrix V installed too. You should install VC5 applications alongside VC4 applications for the time being at least. Also because their are new sound engines in VC5 applications so older preset's might not sound the same using the same settings.
Arturia is working on a application to make it possible to use your old presets in VC5. But still the old presets might not sound the same in the new applications.
It's odd the soundpack is not included in the new Matrix V2.