What are the names of the virtual instruments in Mixcraft-- not the names of the individual presets, but the names of the plug-ins associated with those presets? If you aren't sure, select a preset that you're interested in, then click on "Show Details." In the bottom half of the expanded window, what does it say under "Synth"?
Many of the virtual instruments in Mixcraft are third-party plug-ins, so you might be able to install those on the V MACHINE by copying their DLL files.
As for the ones that actually do belong to Acoustica-- Acoustica Instruments, Acoustica Expanded Instruments, Acoustica Studio Drums, and Pianissimo-- I haven't checked to see if they have DLL files that can be copied; but even if they can, they might not work unless they're properly registered in the computer's registry.