VI PRO has many features that the new Synchron Player has not. Therefore you have good reasons to use the old version of the libraries.
But as it is know an either or when it comes to VI PRO features or Synchron Stage MIR.
Please create a special version of MIRx Synchron Stage for the benefit of VI PRO owner. Perhaps with the extra condition that you must own at least one SYNCHRONized library.
This will make many customers happy and it is only fair. If you have paid for the the old libs, VI PRO and a SYNCHRON upgrade I think one should be entitked to a MIRx version of the Synchron Stage.
Masi