Sorry, I'm late !
So ! I just installed ensemble & instrument pro on both pc, as there is several licences.
Yes, I set the correct path in vep and in cubase.
On the master pc, I loaded cubase & vep as vst instrument.
Maybe, at the vep & vip install, one should install vst2 plugins as well ?
I think I forgot to say both pc are 64bit, windows 7.
For instance, in my old pc, the slave one, I loaded BFD2 in vep, controled by cubase in the master pc and it works perfectly. But in slave pc vep, there is no vip, however, vip 64bit is a dll, the path to that directory is correct : I can find the other instruments from that directory. Very strange !