I'm in the same boat as you are. The DVD that we have has the single installer. However if you download the latest updates from Sony you don't need to actually run the vmspe110_dvda50_suite.exe. I just installed moviestudiope11.0.322.exe and dvdarchitectstudio5.0.186.exe and pass the license along as mentioned earlier in this thread.
Anyway, my problem is that it still asks for registration when the programs are launched. Any way around this? You mentioned "All sorted I had to change a few things in my script." Could you please share that script with us?
Thanks.