Thanks Yves,
I am now facing some problem.  I have created an application that is acquiring some data by the ADC with a high frequency.  This is done with the old version of the general library of the peripherals (V2.X.X).  I am trying to include a USB communication between the uP and the PC to send these values at a high pace. 
I have at the same time the example called "VirtualCOM_Port" that is working good and which has been developed with the new library (V3.X.X) (or at least newer as my application).
How can I update the drivers for the first one without affecting its functions?  Is there any recommended procedure or best-practice to do that?
How should I integrate both in one application, since they call different libraries and includes that may define the same things different?  Which things I should consider in order to keep the applications clean?  Again, is there any recommended procedure or best-practice to do this as well?
Thank you and thanks in advance to everyone that will help me 
JGemio